Zeoticus Gremory/Relationships

Rias Gremory
Prior to the start of the series, he planned a engagement with Rias and Riser. Though after the engagement party was crashed by Issei, he reflected on his mistake of forcing his beliefs onto his daughter.

It was revealed that he also had great love for his daughter when she was very young. He and Sirzechs would cry with joy and have nosebleeds by looking at how Rias acted when she was an infant, and took many video recordings of Rias.

Issei Hyoudou
He at first was disappointed at the fact Rias did not marry Riser to connect the families, but later accepted his daughter's content of loving Issei. He soon become fond of Issei and became good friends with Issei's parents and accepted him happily into his family, even wanting Issei to call him father. Like Sirzechs, he also shows great faith in Rias and Issei's relationship, although he often embarasses the two (more often Rias). He also supports Issei's harem.