L.S.
My almost 5 year old son does the same thing. If daddy isn't doing something fun with him, he wants nothing to do with him. My son has been trying to get my husband to sleep on the couch. I think they all go through it. When my son tells his dad to go away or to sleep on the couch, I treat it like I would if he was being mean to anyone else. I tell him that we don't talk like that to other people. I even give him less attention afterward to show him that he's not getting anything from me being mean to his dad. I didn't have half of these issues while I was still working. I think some of it is that he spends all day with me, and daddy is taking the attention away. As long as he's fine with daddy when you're not around, I wouldn't worry.