"Great-great-great-grandfather" in English is grande grande grande nonno in Italian.
nonno nonno
To say "great grandfather" with 11 greats, write the word "great" eleven times and then write the word "grandfather." Some people say "eleventh great grandfather."
16th great grandfather
No, his great grandfather was a German immigrant to the United States.
The term for great grandfather in Sanskrit is प्रपीतामहः (prapītāmahaḥ).
Overgrootvader
bestefaren
pradedo
Great grandfather in Danish is "oldefar."
The brother of your great great grandfather would be your great great granduncle.
My great-grandfather is mon arrière-grand-père in French.