Oma and Opa are the german and dutch words for grandmother and grandfather, my father's parents were always known to me as Oma and Opa, almost never used their names Beatrix and Johannes... their siblings, i don't remember the word for uncle but for great aunty, "Tanta" or something like this

i remember at the age of 4 years old when we would visit them (for a time we lived in an adjacent property) there would always be kisses for both Oma and Opa at greeting, one on each cheek 

 Yeah, German would be Tante. 

 And Onkel. 

 ah yes... i think the thing was my opa's brother lived in the netherlands 

 ah yes, the dutch say "oom" like "oom piet" uncle peter, the oo being pronounced like the o in home 

 oh i love me the sound of a big tall dutch woman speaking a thick northern accent wawwwww *gurgle* 

 seriously, idk if you have ever heard the way a group of dutch women sound when they talk to each other it's like a gathering of songbirds 

 😊