How about your daughter was my mother, meaning you are not blood related to my father. My mother died a few years back and my father never was the same (he has spells of madness sometimes lasting for days even weeks). Because you were his wife's father, he refused money, clothes, or shelter from you, seeing it as charity. During one of his spells, he decided to give me to Nero;
1) because he had no income...
2) Nero threatened to kidnap me and kill him otherwise if my father did not comply..
3) Every time he saw me he was pained because i was an exact replica of my mother.
Without your consent, he sold me to Nero seeing it as the only way. He know that if he consulted you, you would only refused and be angered by the suggestion.
Does this work?