How to tell my dad I'm pregnant...

This is my second baby and everyone already knows but my dad. Problem is my dad isn't a good guy (in and out of jail for violent crimes, a lot against women, bad people are sometimes after him). When I had my son he got his name tattooed in big letters on his arm without my permission and I know he'll do it again. I'm not sure what to do because I don't want my children's name on a criminal or him posting about it on social media.