Somebody in the group text says they can help with Mom. It sounds like progress, and you want it to be progress. Before you write it into the plan, look at what the sentence actually commits to. Most of the time it commits to very little, and that is not the same as a lie. It is an offer that has not been finished yet.
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.
Read the verbs
Offers that will not land usually use soft words: I can look into it, I will try to swing by, let me see what my week looks like, whenever you need me. None of these are refusals. None of them are schedules either. Write down the exact verb your sibling used. If no time is attached to it, log it as a maybe, not a yes.
Turn the offer into a line item
A workable offer answers six questions. What is the task? Which day and hour? How long does it run? Who drives, and who pays for the gas or parking? Where does it happen? What happens if the person cannot make it? If the offer answers only the first question, you have a wish. If it answers all six, you have a shift you can plan around.
Ask for the missing parts in the thread, in plain words: On the next appointment, which day will you take her, what time, and who is on the drive home? Keep the question short and write the answer where everyone can see it. A reply that repeats the offer without a date is still a maybe.
Check whether the date ever arrives
One pattern is worth tracking. The offer shows up at the meeting, gets a round of agreement, and then the calendar stays empty. At the next meeting the same person offers again, and the requests go back to you. Keep a short record of each offer and whether it turned into a dated entry. Two or three offers that never got a time tell you more than any single conversation.
Be fair to the person making it
Your sibling may be sincere and still unable to commit. Work schedules change, a child gets sick, a spouse's job moves. That does not make the offer worthless, but it does mean the offer should not be the thing the whole plan rests on. The question is not whether they mean well. The question is whether anything on the calendar would still happen if they got busy next week.
What to do with a maybe
Keep maybes in their own column in your notes. Plan the week with confirmed shifts only, then add maybes as bonus coverage if they turn into dates. This is not punishment. It is accounting. A plan that counts a maybe as a yes will fail on the first Tuesday the maybe does not show up, and that failure lands on you.
When a sibling does give a real date, confirm it the day before with one line in the thread. Confirmation is not nagging. It is the step that turns a kind offer into a commitment everyone can see. If you want the wider meeting checklist, the Start here page walks through it.