They would be the grandparents.
t They call them Mum (I'm British) / Mom and their Dads Dad or Pa just like we would
Parents.
Dads typically call their sons by their first names or nicknames.
u call your dads brother uncle in English
i would call him mr.(want ever his last name is).
A cousin, in all those difficult cases they are your cousins
Farfar or morfar, it depends on the side of the family. If it was my mothers father then I would call him morfar but if it was my dads father then I would call him farfar.
Aunty
A cousin.
your cousin.
If the groom's name is John Doe, then you would call his parents Mr. & Mrs. Doe.
His dads name was Eli Whitney