Frank Buffay Sr. is Phoebe and Ursula's father. He, Lily and Phoebe Abbott were involved in a sexual relationship together, which resulted in Phoebe falling pregnant with Phoebe and Ursula. Frank and Lily married and planned on raising the twins together. However, he walked out on his family and divorced Lily when the twins were just babies. He later remarried and had a son, Frank Buffay Jr., whom and his second wife he eventually abandoned as well.