So my fiance's father abandoned the family before she was born. She was raised by her mom, brother, and extended family on mom's side. Fiance's birth certificate does not have her father's name (only mother). No one in the family really mentioned the father, and when they did, it was not in any favorable light.
I don't even know the guy's name or where he is.
So my question is: on the I-129F, page 6, the section about the beneficiary's parents, can I just put down the father's name as N/A? And explain the situation in the Supplementary explanation section?