Do you or have you ever favored one of your children over the other(s)?

I know it’s not suppose to happen this way, but it does and we are no exception. Our son was a very intelligent child. He quickly picked up that we were favoring his sister, more than him. He had a conversation with his mother over this. Some children demand more time from their parents, than others. This was the case with our daughter. She wanted to be under her mothers coat tail all the time and cried if she could not be there. Our son was told this and he stated that he understood. That was about 25 years ago. Today, it’s a different ballgame. Both are treated equally and all is well. Question: have you or your partner ever favored one child over another? Were there reasons for this favortism? How did you handle it?