With £50k, I’d do some work to the house, have a nice family holiday and put some money into savings accounts for the kids, otherwise life would go on as normal (give my parents and in laws some cash too)
I’d probably do the above, plus give up work, if we won £500,000 but DH would still need to work and again I don’t think our lifestyle would change massively except it would all be easier without me working. Also donate to a cause or causes i support too.
£150m on the euro millions - I’d work out which charities/causes i’d want to support and get involved there, give all close family good sized gifts, then we’d go off round the world to stay in five star hotels and have amazing experiences (with tutors for the kids!) Then probably continue to life in the city we live in, but in a dream home and with a number of holiday homes abroad.
I don’t actually play the lottery though! But nice to day dream