Where is Lorraine's father in Paul Zindel's The Pigman?

Lorraine's father is not in the story. He
died six years before the events of the story take place. Lorraine doesn't even remember
anything about her father, because Lorraine's mother legally separated from him right around the
time of Lorraine's birth. The reason for the legal separation is because Lorraine's father had
an extra-marital affair during the pregnancy and contracted a venereal disease of some kind.
Lorraine's mother found out about all of this and filed for legal separation. The discovery was
shocking to everybody involved, because Lorraine's parents had been childhood sweethearts. This
information can be found in chapter 10, and it explains a lot about her mother's general hatred
of men.

It must have been awful for her when she found out
about him. She never talks about him nowjust how awful men are in general. Shes what the
psychologists call fixated on the subject.

Lorraine's
mother simply hasn't ever gotten over the awful end to her marriage. She is incapable of viewing
men differently than she views her former husband.