We have never really had that much problems...they seem to really get along...they to tend to wrestle and play with each other but nothing mean or hurtful to each other and as they get older they play better and better...Sailor is now 3 months and she loves to play with Magic...they chase after each other and run around together all the time...we have been told that having two little ones is not the smartest idea but from our experience it has been great...they learn so great from each other and neither tend to be too dominating...