Its very common for kids of this age to show a strong preference for one parent. It doesn't mean you are a bad mom! In my house, it was the other way around, and my husband had a really hard time dealing with it. My son is now three, and once again he's happy to hang out with either parent (though I'm still the one he comes to if he's really upset.) Partly, I think he outgrew it, but I think we did some things that helped. The most important thing, I think, was making sure my husband had regular one-on-one time with my son. At first, this was done despite my son's protests, but after a short while he came to expect and even demand that one-on-one time. I think another part of the problem in our family was differences in discipline style (my husband was both more strict and angrier). We talked about it, and I agreed to be more strict and I explained to my husband the importance of disciplining without anger. For a short while, we agreed that I would do all discipline whenever we were both there, but now that we are on the same page, discipline-wise, we both do it. The one other thing that may have helped was that I started expressing how much I liked seeing Papa, and how much I couldn't wait for him to come home, etc. Good luck, and hang in there!