SplitKin

Family finances · 9 min read

How to Split the Cost of Caring for Aging Parents Between Siblings

The real monthly cost of elder care is almost never shared equally. Here's how to make it fair · the three models families use, the expenses nobody counts, and the two conversations that stop the quiet resentment.

By Leandro Puca9 min read

Nobody tracks the real cost of caring for a parent until they’re a year in and quietly furious. By then, one sibling has absorbed six, twelve, maybe twenty thousand dollars of not-quite-reimbursed caregiving expenses, and the rest of the family sincerely has no idea.

This isn’t a family-finance article in the usual sense. We’re not going to tell you to budget harder. The underlying problem is that in most families, caregiving money moves without anyone deciding, in advance, how it should move. One sibling’s card is just there when the pharmacy calls, when the aide needs to be paid, when mom’s groceries run low. That sibling pays, forgets to screenshot the receipt, tells themselves they’ll settle up at Thanksgiving. By Thanksgiving they’ve forgotten half of it. And a pattern locks in.

What follows is the actual framework we use in SplitKin to make splitting fair · the three models families use to divide costs, the categories most families forget to count, and the two conversations that get everyone on the same page.

What actually counts as a caregiving cost

The first mistake most families make is undercounting. If you’re only tracking the obvious invoices · the aide, the facility, the big pharmacy bill · you’re missing half the real number. Here is what counts:

  • Medical: prescriptions, copays, over-the-counter supplies (incontinence products, nutritional drinks, wound-care supplies), dental, hearing, vision. Insurance gaps.
  • In-home help:aides, housekeepers, meal delivery, lawn care, snow removal. Anything you’re paying for that your parent used to do themselves.
  • Groceries and household:food, cleaning supplies, toiletries. If one sibling is buying mom’s groceries weekly, that goes on the ledger.
  • Transportation: gas, parking, rideshares to appointments, out-of-town travel specifically for caregiving.
  • Home modifications: grab bars, raised toilet seats, stair rails, ramp installation, bathroom renovations, medical alert systems.
  • Facility costs:assisted living, memory care, respite stays, hospice. The sibling-funded gap between what the parent’s income covers and what the facility bills.
  • Legal and administrative: elder-law attorney, trust and estate work, POA documents, Medicaid planning, long-term care insurance claim fees.
  • Hidden costs:the sibling who’s hands-on usually also pays indirect costs that nobody logs · their own gas and tolls to get to mom’s, meals eaten at mom’s or in waiting rooms, lost workdays.

If you added all this up over a mid-stage year of parent care, most families land in the $8,000 to $40,000 range. Memory care or dementia care can push past $80,000. These are not small numbers to leave unspoken.

The three models families actually use

Not every family should use the same split. Pick one on purpose. The important thing is picking it together, in advance, and writing it down.

Model 1 · Equal split

Three siblings, three equal shares. Simple and uncontroversial. Works when incomes are roughly similar and time contributions are roughly similar.

Fails when: one sibling earns four times the others, or when one sibling is already contributing 20 hours a week of hands-on care that nobody is counting. The equal split becomes a tax on the sibling with the lower income or the bigger time commitment, and the resentment compounds silently.

Model 2 · Proportional by income

Each sibling’s share scales with their income. If one sibling earns $200k and another earns $55k, their shares aren’t 50/50 · they’re closer to 80/20.

Fails when: nobody wants to name their income. This model requires the uncomfortable conversation of actually exchanging numbers. It also doesn’t count the time contribution of whoever is on-site every day.

Model 3 · Hybrid (time offsets money)

The sibling doing hands-on caregiving pays a smaller share of the money. The siblings who can’t be hands-on contribute more financially to balance it. This is often the most honest model, because hands-on caregiving is itself a huge contribution.

A worked example. Three siblings, cost of care $2,400/month. Local sibling does 15 hours/week of care. The family values caregiver time at $25/hour (roughly the going aide rate), so $1,500/month of their contribution is time. They cover $300/month of the cash. The two long-distance siblings each cover $1,050/month. Everyone contributes roughly $1,350 in combined time and money.

Fails when: you don’t track the hours. The hybrid model is the most honest, but it’s also the most fragile without a shared record of what’s actually happening. This is where SplitKin’s contributions view earns its subscription · time, money and decisions in one place.

The three cost categories nobody counts (that always come due)

Even when families do start tracking, a few categories get chronically missed. Add these on purpose:

1. The on-call tax.The sibling who’s local is on call for every emergency: the fall, the sudden hospital visit, the aide who no-showed. The cost of being on call is not a line item · it’s unpaid time, worry, and a loss of flexibility that affects every other part of their life. One way to recognize it: a modest monthly flat fee from the non-local siblings specifically for being on call.

2. Decision work. Research into facilities, home-care agencies, specialists, legal paperwork, Medicare plans, long-term care insurance. This is often invisible labor done late at night by one sibling. Count it, by hours, in the contributions view.

3. Lost earnings. If the caregiving sibling reduced work hours, dropped a promotion, or left a job for parent care, that is a real cost. Some families handle it by the other siblings paying the primary caregiver sibling directly. We cover that case specifically in Should siblings pay the caregiving sibling?

The two conversations that fix most of this

Conversation 1 · The setup (one hour, early)

Have this once, as early as possible in the care journey. Ideally before major costs appear.

  • Agree on which model you’re using (equal, proportional, hybrid).
  • Agree on how often you’ll settle up (monthly works for most families).
  • Agree on who’s tracking what. If you use SplitKin, this is automatic. If not, pick one sibling to maintain a spreadsheet and share it.
  • Agree on a renegotiation trigger. If costs double, or if one sibling’s time commitment doubles, revisit the model.
  • Write all four down.

Conversation 2 · The monthly settle-up (15 minutes)

Every month, one sibling (or the SplitKin app) says: here’s what was spent, here’s what each sibling owes based on our model, here’s who sends what to whom. One Venmo or Zelle per sibling. Done.

The brevity is the point. The monthly rhythm prevents the “we’ll figure it out at Thanksgiving” pattern that is the source of most sibling-finance resentment.

How SplitKin does this automatically

You chat in the family circle the way you already text each other about mom. “Picked up her meds, $127.” “Paid the aide for the week · $340.” SplitKin’s AI reads the message, extracts the amount and the category, and files the expense. Your chosen split applies automatically.

At the end of the month you see “Ana owes Luis $342.60, Marco owes Luis $218.00.” One transfer each, logged in the circle. The next month starts at zero.

SplitKin doesn’t move money. You settle up using Venmo, Zelle, Wise or your bank · whatever you already use. We just make sure the number is right.

Stop losing money and goodwill in the same month.

SplitKin extracts expenses from your family chat and splits them your way · equal, proportional or hybrid. Free for 14 days, one subscription for the whole family.

Have a question or a story you’d like to share? Email hello@splitkin.com · we read every note.