Our kids are 10, 7, 4, and 2 (about to turn 3 in a couple weeks). I also have a 19 & 17 yr old from a previous marriage, but they are no longer at home.
I have noticed our kids fighting A LOT more with each other lately. The 10 yo in particular is especially bad to throw out derogatory comments to the younger ones (particularly the 7 yo). I can see the effects on them... Yet, anytime I mention possibly leaving they all get incredibly upset and I'm the bad guy who 'just wants to be mean to them and daddy'.