Urgroßmutter
Yes. His grandfather was German, as was his great-grandmother, and his great-great grandmother on his father's side. His grandmother on his mother's side was German, as well.
Tatarabuela Grandmother: abuela Great grandmother: bisabuela Great great grandmother: tatarabuela
Grandmother Barbara in German is Großmutter Barbara. Grandfather Kevin in German is Großvater Kevin.
You would say "oumagrootjie" in Afrikaans to refer to your great grandmother.
für meine Großmutter
Great grandmother in Polish is pronounced as "prababcia".
In Portuguese, "great grandmother" is translated as "bisavó".
Urgroßmutter
Your grandmother's mother is your great grandmother and your son's great-great-grandmother.
In Kikuyu, great-grandmother is said as "Mùkoromo wa ituku".
Grandmother = Großmutter grandma = Großmama nana = Oma/Omama
The Welsh term for 'great grandmother' is "nain fawr".