Tama, which is the same translation for father.
As there is no direct word for Grandpa in the Samoan language, Tama (Father) is always used, so I would say: Fa'afetai, Tama.
Andrew is not a Samoan name therefore has no Samoan translation.
Leonard is not a Samoan name so does not have a Samoan translation.
Steph is not a Samoan name therefore does not have a Samoan translation.
Samoan Union
Kaupoe Samoa
Elena is Samoan for Helen.
Victor is not a Samoan name so therefore does not have a Samoan translation to it.
Dave is not a Samoan name so does not have a translation in the Samoan language. However, David is in the Bible, therefore has a translation as, of course, Samoa is a very religious nation. The Samoan translation of David is TAVITA.
Michelle is not a Samoan name so would have no translation for it in the Samoan language.
Adriane is not a Samoan name so does not have a translation in the Samoan language.
You = oe.