to be honest it is impossible for the bitcoin price to grow that much right now thus you wont be able to buy a house for your btc for a really long time in my opinion
though if the price would go up that much i think you should buy eeverything you want if it makes you rich because after some time the price might fall once again
Everybody seems dreaming here therefore I want to dream bigger. What shall I do with a house? It's ok if one is looking for security or such but not me.
I'm looking for fun.....

A house is one of the most important things you can have in my opinion, you are having kids and they need a house and a nice house because I want to let them have a nice room and all so I do not consider it as fun with a house you can have a lot more fun if its a good nice house where you can live for your whole life and can let your kids grow up.
Overall I think it would be nice if you are going to buy a house in bitcoins if the bitcoin is gonna rise to a high number of course.