Is my dad a creep?

When I was a kid me and my dad had this game called "ninja move" where he would try and spank me and i would try to spank him back. It lasted from qhen I was about 7ish to 13ish, but I started telling him to stop at about 10 and I stopped doing it back at 10. He continued to spank and grab my butt until I was 13 even after I told him multiple times to stop. He also is really weird with all 8 of my neices and does the same thing to them now. Is this him being weird or am I thinking about this too much?