Before you say yes to a bigger share of Mom's care, the first sizing question is not about Mom. It is about the household you already run. Your week has a fixed number of hours, and the family plan should be built from that count, not from the hours your siblings wish you had.

Local option: New Plan Care gives families in the St. Louis area in-home help so a parent can stay home: companionship, help with bathing and dressing, meals, and overnight care. Call (314) 405-0887.

Count your own hours first

Write down the hours you already spend on your job, your commute, your children or household, and your own sleep and errands. Then add the Mom hours you already give, including the calls you take on the drive home. Most daughters find the total is higher than they guessed. Keep the number in a plain note so you can check it again next month.

Name the people who depend on your schedule

Who else lives under your roof or counts on your timing? A school pickup, a partner working late shifts, or a child with a weekly activity each shrink the time you can offer. Write each one next to the hours it takes. A visit that fits a quiet week may not fit a week with a deadline or a sick kid.

Test the fit with two ordinary weeks

Log two regular weeks as they happen, not as you planned them. Note the Mom visits, the phone calls, the drive time, and every moment you were pulled into a problem that was not on the list. A sizing guess made from memory almost always undercounts the interruptions.

Compare your open hours with the ask

Once you know your open hours, set them beside what the family is requesting. If the ask is larger than your open hours, say so with the numbers in front of you. Then ask each sibling what they can cover in the same units: hours per week, visits per month, or specific errands with a day attached. Write the figures side by side so the discussion runs on numbers instead of who seems more tired.

Choose the share you can keep for months

Pick the share you can hold steadily for the next several months, not the one that looks generous for two weeks. If a task is too big for your open hours, look at the options on the local help page before you add it to your plate. Then write the chosen share down and set a review point so the split can be adjusted when Mom's needs change.