I've always been told mothers side....the "if your moms dad is bald you will go bald" thing has been true from what I've seen.
Both of my grandfathers had thick hair till the day they died so I think I'm good....hopefully
This isn't true. Balding is a dominant trait for males so you can get it from either of your parents. If your dad is bald, there's a pretty good chance you're going bald too.