Community content is available under CC-BY-SA unless otherwise noted.
Lynn Sr.'s father is an unnamed minor character, who only makes one physical appearance in "Vantastic Voyage", but only in a flashback.
His appearance looks similar to a 1970s hippie. He has white hair, a white mustache, and goatee. He wears a tan bandana, and circular glasses with purple lenses. He also wears a purple long sleeved shirt, with an orange vest, blue pants, and red sandals. He also wears a peace necklace. He has similar facial features to his son. However, in Lynn Sr.'s flashback in "Home of the Fave", his silhouette has shorter curly hair.
He was first mentioned in "The Sweet Spot", but makes his first physical appearance in "Vantastic Voyage", as a hippie, which means that he possibly originally owned the Loud House. It is unknown if he's alive. He is mentioned in "Home of the Fave" when it is revealed that he used to play favorites when Lynn Sr. was younger.