I do know that there are some family and "friends" who would come out of the woodwork if they had any idea I'd got money.
But I've thought that there are ways of being quiet and giving just enough info to keep people of your backs, eg, admitting to a win smaller than you actually have. People are used to me not sharing info, and I can be very vague at times. I'd be admitting to a small win, because I would have to explain how I could afford to buy a house as a single mum getting some benefits even though I'm working.
I'm not one for splashing out, so no real difference there. I'd do stuff without telling people, eg, who needs to know if I suddenly hired a cleaner? I'd also buy a small business to explain away some of the money.
Meanwhile, I'd be getting on and doing the stuff I've long wanted to do, such as getting a degree (never had one), learning to play some instruments, and learning languages now that I have my hearing aids.
Kids would get an allowance, but not too much. DS wants a decent desktop PC for gaming, which he would have room for in the new house I'd buy.
I'd get decent financial advise, though, would take the advice of the pp who mentioned private equity advisors.