A 9 lb Yorkie, a 3 lb Chihuahua, and a 12 lb cat are about all I can handle!
Seriously, I don't think I could have added "parenting" to my list of responsibilities over these past 8 years. I'm not saying it can't be done, because there are people who do it all the time. I just know myself, and that my energy reserves aren't without limits. It's been difficult enough just maintaining a marriage and taking care of myself. I've lost count of how many times I've stopped working out d/t schedule constraints.
I keep thinking that maybe after residency we'll have children, but by that time my wife will be 37!