My two oldest kids are best friends (5 and 3.5). What they have been doing is going into their room and closing the door. They will play in there for an hour or two quite happily. However, my one year old will spend that time crying and banging on the door because he wants to come in to play.
I can't decide what to do. Sometimes just the baby and I play together and other times I insist that the kids leave the door open and let the baby play with them. The baby isn't super destructive but my 5 year old is a bit OCD and has trained the 3.5 year old to also be OCD (they like to line up all the cars or make a train track and line up all the cars around it). Clearly, the baby messes that kind of stuff up.
Is it too much to ask that learn to play with the baby also present? I did force the issue this morning and right now things are actually going ok.
I wanted to have all my kids close in age so that they could play together and be good friends. Due to my miscarriages my third child is 2.5 years younger than my middle child while my first are only about 16 months apart.