The main objective for me would be to make sure that their housing situation is stable.
My parents: $200,000 to pay off their mortgage and car loan. They don't need it (government pension), but it would give everyone peace of mind. I am a unique child, so I would get the money back in 15 years once they pass.
3 friends from high school (homeowners): their mortgages are taken care of. It would be a little over 1 million dollars.
1 friend from high school (not a homeowner): I am buying a small home for her, outright in cash.
I am hiring a private investigator and buying a bunch of DNA tests (23 and me/Ancestry) to find out who my biological father is. I would help him out if he needs it, regardless of whether or not he wants a relationship or not. In terms of my half-siblings, I would also help them get their housing sorted out.
Anyone else's request will be ignored.