His father has not been introduced. The anime suggests he is also a Pokemon Trainer:
His father has not been introduced. The anime suggests that his father was once a Pokémon Trainer who began his journey in Pallet Town, and that he is still living. In the original, he is also confirmed to have a grandfather, and his son (Ash's father) followed his footsteps. An interview with the series' storyboarder confirmed Ash's father is a Trainer on his own journey. According to the same storyboarder, Ash's father may or may not be introduced in the series, depending on its necessity to further Ash's maturity and development as a Trainer.