Calm down, God don't crap:) Let's hope anyway!
Worst case scenario? Dad will cause you to be DF'd and won't talk to you anymore. It's been a year since you have been to a meeting and he hasn't caught on yet? Not an incredibly close relationship. He probably now suspects something(cowering 12 year olds tend to raise suspicions:)) and won't pursue it, because what they don't know can't hurt them and they really don't want to reject you any more than you want them to shun you.
Ok, some of the above is pure speculation--but did you think it would never come up when you have very talkative aged kids? If they were 2 and under, you could get away with some stuff-temporarily. Maybe
Why'd you lie about the PO? Wouldn't it have been easier to say-'no I haven't met the guy yet'? Which is true and doesn't paint you in a corner? (I figure it popped out, but wonder if it was a considered choice of fib)
I am not judging you at all, and I hope all goes well for you with the superJWdad. My uncle used to be the super JW(wouldn't talk to nice lil me). The 3 ex wives,alcoholism,bankruptsy, innumerable children/stepchildren/child lost to suicide, another to leukemia kind of humbled him, and he now talks to ex JWs. Of course, he doesn't have ONE JW in his immediate family except my mom. I realise that this is not very encouraging REALLY,and I would not wish any of that on anyone! However, the supers often fall off that horse when a child 'strays'. That 'earthly hope' seems pretty far off when the people you love the most are inaccessible in THIS life, in the present.
All my best to you and your family, including your dad. It is a hard thing to be a superJW!