I would do something on the carseat issue. Seriously. Warn him and then if he doesn't comply call the police right after he leaves you and tell them. Let him get pulled over. That is so incredibly dangerous. He is breaking the law and putting K in a dangerous place.
Me: 46 FWS: 36 Married and Divorced 4/07, Pregnant 7/07,False R 7/07 Baby Girl born 3/08 Kicked him out because OW: 7/08 5/10 He realized what he had and lost. Moved home! REMARRIED 3/14/11!!