i have my future plan for my kids,i want to buy bitcoins.In future bitcoin value will rise surely.
Who know about Future? anything can happen hehe, maybe bitcoin get drop to 1K usd then what will you do?
You can't depend only on Bitcoin you should save fiat money for your Kids.

When it comes to the future of your kids you need to try to play it safe, bitcoin is a great investment, but you need to also have some fiat in the case bitcoin fails, it is not nice to think about such possibilities but since the possibilities of that happening are real then you need to have a plan B in the case your plan A does not work for some reason.