it sounds to me like you are traumatized by this situation, i would definitely keep your guard up

this seems like a bizarre situation, has he made any more comments like that in the past 3 yrs? i still would get out ASAP!!

It is probably for the best that you feel uncomfortable around him, what happened even as a one off was not right. There is a boundary that he crossed from where there is no going back. Feeling uncomfortable and scared isn't nice but you need to feel like that to stay safe.

You tried to speak to your mom at the time, but she wouldn't talk, but have you brought this up with her since? I think you should try again, tell her you're scared for your safety, her safety, your sister's safety.

If your dad was having emotional problems that have since improved you still deserve to know why he did what he did, but I think that even if that is the case it doesn't excuse what he did and I think it is right that you don't feel safe around him.

Take care and make sure not to spend time alone with your dad and the same goes for your sister too.

Hi honey. I'm so sorry that you're feeling that way. I went through something similar w/ my father when I was a young teenager and I have to tell you that even after he stopped being "inappropriate" towards me; the uncomfortableness(hurt, pain, even hatred) has lasted to this day. Its gotten some better now that we're back in each other's lives and it's been discussed but I think I'll always be uncomfortable around him. The circumstances w/ my mother were also the same as yours; w/ her burying her head in the sand. Don't feel bad for being uncomfortable and I DON'T think you should relax and trust him even if it's been a few yrs. I agree w/ what everybody else posted to you about being careful or even trying to get out of the home. Regardless of how he acts now; YOU are still in pain. I urge you to talk to a therapist because the repercussions of even that one time could last you a lifetime. You hang in there girl.