Then:
I used to think like you guys. I have 17 neices and nephews from 2 to 16. Loved to watch 'um but more glad to return 'em.
Now:
I have a little boy of my own, 11 months old. Yes, it is a lot of work "I'm also building a house". But, to pick him up in the afternoon and have him crawl to you as fast as his little legs and arms will carry him, yelling "Da, Da", Now "that" is priceless!.