Hi, my 2 year old girl loves playing with her only cousin, 4 year old boy. They are always excited to play together, but then after just a few minutes of play they fight over toys or whatever. This happens over and over again and ends up either someone will cry or the other was hurt. Iím always worried and sometimes I feel like I donít want them playing together anymore. Am I being selfish? I also donít want to have any conflicts with my sister regarding our kids. How do I deal with this?