How to invest minimum payouts from retirement funds

[Landlady]

I'm seeking advice for my father who is having to withdraw the minimum payments from his 403b and IRAs. The total comes to about $2,000 a month. He wants to invest it because he's getting plenty of monthly income from his pension to live on.
He's 72 and I want to help him make good decisions for my mom who is 64 and wants something simple to manage. The long story is that he's recently been diagnosed with leukemia and my mom will help manage his finances while he's getting chemo.

[seattlecyclone]

Vanguard index funds are good. What is the goal for this money? If he thinks he might need to tap into it in the next few years to pay for medical expenses, putting a good chunk of it into a bond fund is probably a good idea. If he truly doesn't need the money and just wants to maximize the expected inheritance for you and any siblings, VTSAX is always a good bet.