Mr Boyce was an unseen character in Only Fools And Horses and the father of Boycie, aka Herman Aubrey Boyce. Mr Boyce's first name was never revealed in the show.
Mention in "Sickness And Wealth"
Mention in The Green Green Grass
Children: Herman Aubrey "Boycie" Boyce (1945)
Grandchildren: Tyler Boyce (Boycie was a Jaffa but may have had a spout of fertility).