My daughter loves my dad more, what should I do?

"Daughter loves dad more, what to do? You're with her all day – you make her eat and sleep, and take medicine when you need it. And he came after work – and the light in the window for her, just playing and lisping."I received such a letter from a friend and again wondered – Why does my daughter love her father more? I can't consider the issue of my sons, since I have two daughters and no sons.