Your Happiness Comes First.
My mother had MS while I was growing up. It was only natural to make sure she was OK. Sure, we were kids and did our own thing too, but Dad made sure Mom always had someone with her. So, giving of yourself for someone else to be happy, is a life lesson I'll always have within me. I am so naturally a care-giver, I always step forward when someone is in need. As I continued in life, I learn giving someone happiness is a more selfish thing to do. Once you make someone happy, you'll want to do it again and again.
And then you have kids.