Harry Potter’s paternal grandparent is Fleamont Potter. He was a full-blood wizard and also went to Hogwarts School of Witchcraft and Wizardry. Also, like his grandson, he was sorted into the Gryffindor House and might be the reason why Harry was a Gryffindor as they have the same blood of courage that ran in their veins.
Fleamont got married to Euphemia after graduating Hogwarts and had a son, who is Harry’s father, James Potter. Fleamont did not have a long life for him to have a chance of meeting and seeing his grandson, but Harry is surely proud and look up to him. He is also James Sirius, Albus Severus, and Lily Luna’s great grandfather.