Sister is only 56 without a minor child at home so cannot draw SS until age 60 at earliest. And at that age it would be reduced to 71.5% of his check, and her earnings limited to something like $17,600 (forget the exact number) before she starts losing $1 for every $2 earned above that.
Luckily, he was almost 70 and hadn't drawn SS yet so his benefit is about $3,000. If she draws it at 60 she gets $2145. If she waits until she's 67 she gets $3,000. Her own benefit will be small so there is no advantage to switching to her own benefit at a later date.
She's definitely going to sell the rental property, maybe next year because her low income next year would shelter the capital gains on the rental property I believe. She has definitely lost her handyman, although my not quite so handy brother lives in town and could help with some things. Keeping it long term as a rental is not a good idea and I didn't even include that in any of my scenarios.