Sounds pretty normal and dad will not parent like you do. Talk up positive that it is almost time to go to dad's. Maybe have child pick a few toys to bring with him because at that age they like the same toys. 50/50 takes a lot of work on both parents part to make it work. Soon your son will be able to talk more about what he does at both houses and it will become easier but remember that courts care if he is fed, clothed, has a bed. Try to make it work. Maybe have facetime with him and he has facetime with dad on your time so he can see both of you on the days he is not with each of you? Not sure how you split the 50/50 but many people do 4/3/3/4 or something like that so it is not a full week apart from the other house especially when they are young. Also, if you get along with ex, you can offer both of you a mid week dinner visit if you are close enough. Good luck!