My answer was none not now not ever because I never got around to that when I was young enough to have kids without killing myself. I'm now enough over 40 that I will content myself with a step-daughter, and so far one nephew - to be joined by other neices and/or nephews in the future.....
For those of you with reurning offspring - there is hope! I was a returnee to my folks house at age 30ish - longer story than you want to read. Saved up enough money for a down payment on a house of my own, and thanks to that solid start have never had to move back in since.