Look at your interactions with your kids. It's the same thing. You simply can't give the same amount of attention to both at the same time. You love them both but you're going to have one feeling like you are giving more attention to the other. The website that you pointed out is filled with people running into the same problem.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.