tough situation and beyond me to give advice on this one, so even if i do, just consider it an opinion, and nothing else
but I will tell you one thing
I think one of the reasons our yetzer horah is so strong is to teach us humility.
when I hear of someone falling into things that I never have,I have learned never ever to look down at them knowing that I could easily have gone down that path.
Consider the gemarah at the end of kiddushin when tanaim looked down at people stuggling with lust until they were sent the message that it is wrong to do so,and they were put into those situations to be taught never to judge unless you are in thier shoes---- which you never will be.
again,just an opinion,so don't act on it, (unless you ask a professional),you cannot ever tell your mother no matter what.even if she should know(which is another debate) you are not the person to tell.remember this because as a teenager it is possible that there will be times that you will be very angry or upset at your father.
never ever use this as a weapon against him
that would be something you would regret for the rest of your life.
as far as your father is concerned it is a very tough call and it depends on his personality.If it will cause him great shame that you have uncovered this it could backfire and make things worse.what you can do is daven,and work on yourself as much as you can.as the previous post said,and it is absolutely true,you cannot fix your father but you can fix yourself.
and do not be concerned much about genetic disposition (read the article I just posted in the yechida section)
it's shocking for you to learn that this problem is very widespread but you will see that this is a big berachah.It gives you a strong idea about the underlying issues that are facing Klall Yisroel and you now CAN TAKES REAL STEPS TO PROTECT YOURSELF AND YOUR FUTURE FAMILY FROM THESE TERRIBLE THINGS.
start davening for your zivvug now,every day,three times a day,it is never to early.
and now you have about a 6 year goal,to pull yourself out, with the help of this site and the handbook tools, and do some serious tefillah and you will marry a wonderful girl and live a full and good life free of these harmful things
always keep this in mind
this will be hard work
but well worth it
you have so much to look foward to.
sincerely,
yechida