Is my dad ignoring me for his "new family"?

Well im gonna try to make this short as possible but I need your guys' opinion of this. My mom and dad have been divorced since I was 4 years old (im 16 now). A couple years ago he told me he has been dating this woman for 7 months now. So I met her and she seemed really nice and I was really happy for my dad. My dad and I have always been close but that closeness went away over the past few years. The womans husband..yes..HUSBAND was in jail when my dad told me this for shooting a cop so he had to keep it a secret from her husband so my dad didnt get like..ya know..SHOT! The guy got out of jail a few months later and my dad said I couldnt come around his house anymore or see him much anymore for my safety. (I live an hour and a half away with my mom and I see my dad every 2 weeks) Well eventually the guy got out and things got settled and the lady moved in with my dad. Then the womans daughter and granddaughter moved into my dads house as well. Now my dad works his *** off to support all of them and none of them work. Last year I called my dad up to go with me somewhere just for the heck of it and he blew me off because he had to go eat dinner at his girlfriends daughters house. That hurt me and I cried my eyes out. Ever since then my dad and I havent been close. Everytime I talk to him on the phone he says "someone wants to talk to you" and he hands the phone to his girlfriends granddaughter without even asking me just because she wants to talk to me. They come to my dads side of the family get togethers and my family members talk about them like they are family or something. It sickens me. He keeps asking me to come to his house and hang out for awhile but im not really interested in spending time with his "new family". I mean dont get me wrong im happy for him but like he ignores me sometimes for them and its like they barged in on my family. Its very awkward. Recently I had a trip planned for me to go to canada to meet up with some friends and I really wanted my dad to come with me because my mom didnt wanna go alone and i just wanted my dad to be a part of it and he said he cant because its "bad timing" when i know its really because he has to work to support his gfs family who mooch off him. And my dad is always tired now and never happy because of them. And this trip was REALLY important to me and now i cant go because my dad let me down. I mean i kind of understand his situation but its not fair..Anyways my question is do you guys think im overreacting? or is my dad being kind of unfair? Im sorry for the long question. Thanks for reading