Why wouldn't my daughter's father, my ex, call in for his first Father's Day :\?

You are defiantly right.. u did the right thing by filing a child support btw too. And I believe He only went to her so he can have a place to stay and cause she is taking care of him, but believe me relations like that don't last long. She will eventually get tired of taking care of him and paying for his food and housing him.... by then he will have no other choice but to get a job and support himself and his daughter and hopefully will get back to you