If I should win a huge amount, I would use it to complete my Education & also upgrade my skills since these are areas I'm poor at. Gambling doesn't make you rich until you hit a Jackpot 
I have once have experience on it..And then I got the price to have win,I'm treat with my family going to buy our lunch and have some drinks..We enjoying an at the moment to got the money..but I actually keep some a little bit to invest.
Yeah, better treat your family if you win. But it should be better if you invest your winnings so it won't be wasted. It's really a wise decision if you invest it rather than by spending it with a useless stuffs.
Spending money to treat your family members is not a useless stuff but should fix some portion of the money for these activities instead of spending all winnings. If you win only small amount then it depends on individual needs whether to invest or treat family members but if you win big amount then should invest more money and spend less.