schnp

Two things.

1) I wish people would stop asking you general questions about poly (I'm sure you do too) as you're not really able to answer most of their questions as you were/are not poly yourself. They should ask someone who has actually tried it.

2) I don't see this yet, but how did your dad come out to you? How was his coming out to the rest of his family and friends?

Edit: Make that three things.

3) Was his interest in poly part of the reason he and your mom split?

1) Confirm what biases? Do you mean confirm their assumptions that you're against it?

3) I hope you don't let your father's poor behavior color your opinion of poly so much. Your father (obviously) did not engage in ethical relationships. Most poly people are very ethical about it and don't cheat on their partners.