Katherine "Kate" Daphne Halligan Tanner was the mother figure in the TV series, ALF. In addition to her mother who plays a role in the series, she has at least one sister. She majored in art history and sometimes works in real estate. Like her husband, she was a flower child during the 1960s.
In the episode 'Jump' it was mentioned that she once had a poem published in a magazine which was her goal, this shows her interest in poetry. She gives birth to Eric William Tanner in the season three episode, "Having My Baby" (Anne Schedeen was really pregnant during the series. However, she was pregnant with a girl in reality, which made the twin boys only her TV son.) She is portrayed by Anne Schedeen.