There it about Duo's Grandparents:
Name: Grandpa Alipio C.
Age: 91 Years (2 Years Before)
Afflitation: Family C.'s Pirates
Occupation: one of 3 Elders and Mechanic
Island: Samba Island of South Blue
A.K.A: Mechanic King
Birthday: March of 3rd
Bounty: (appear of 2 years After)
Devil Fruit (Paramecia): Mechanic Mechanic Fruit
Name: Grandma Bell C.
Age: 83 Years (2 Years Before)
Afflitation: Family C. Pirates
Occupation: One of 3 Elders and Prayer
Island: Samba Island of South Blue
A.K.A: Granny Religion
Birthday: September 16th
Bounty: (appear of 2 years after)
Devil Fruit (Paramencia): Summor Summor Fruit: Holy