we were touring Germany 26 yrs. ago & fell in love with the german people. Said when we haqd GC we wanted to be called Oma& Opa.Well, we got our 1st GD 24 yrs. ago & she got Oma right away but had trouble with Opa, it turned into Bump. We are known to all 20 GC as Oma & Bump. I mean everyone, friends etc. call us by that. Love it