I never thought about the connection to Harry Potter before, but it is definitely valid. Kellar has had a really tough life so far, much like Harry, and has basically been on his own in the foster care system. The Apsleys leave a lot to be desired, and Warren is an out of control brat and bully.
As far as his parents, Kellar has even more questions now, really really big ones. I can't say whether he will get answers, but some he can figure out for himself. Like that they were most likely wolf shifters like he is.
Happy you are enjoying the story, my friend. Cheers!