Between my parents and my sister-in-law I have 3 adults I'm anticipating I might have to financially support at some point in the future.

My sister in law is entirely financially supported by her partner who's 40 years older than her, but they have no savings to speak of, and she's spent her entire adult life scraping by and hasn't worked a single job for more than a year and has been fired from every job she's held. Their primary income is her partner's social security disability payments and a small amount of retirement income from when he was working. Whenever he dies (which it's honestly incredible that he's still alive because he's done nothing to help his body and everything to hinder its continued survival) she's going to be completely SOL, so we've already accepted that she will have to move in with us.

My parents might have finally started actually budgeting, and that was only after I bought their plane tickets to a funeral without it being a major financial hit for me and then they heard me talking finances and long-term financial planning with another relative and realized it's past time for them to shape up. I don't know whether or not they have actually been budgeting, and I don't know if they have a stable retirement to look forwards to. I also can't stand them for more than a few hours at a time so we absolutely can't share a house with them.

Right now my medium term plan is to get a house that's more appropriate for 5 people, then later construct an ADU in case my parents need it (and I'd probably rent it to a friend in the mean time) and later on one or both of my kids can probably rent the ADU from us to help them build independence and real world living skills. I'm not thrilled that I have to be the financially responsible one, but here I am so I might as well make the best of it