Closet Relative

I would say my grandma, mom AND dad but I don't see my dad as much as I did and when I go to his house him and his girlfriend just fight. we're close but we're not close close. I live and go back and forth between my mom and grandmas house. We never ever fight and we're all close, happy and we get along. But I don't tell them anything and I'm not open to them about feelings. Or anything. I'm very introverted but they probably think I tell them everything.