i had to wait til my wife turned 17 before i could marry her i was 22 we had our kid when i turned 26 im 28 now.its hard on you with the age diffrence isnt it?just be patient for now,man my wife parents did that to us when we first met.see if you can work out supervised visits try to prove to them your serious about her(i hope you are) and make sure you never use these visits if your lucky enough to get them to do anything sexual,give it time.sit down with them and them alone and have a real indepth conversation with them about what your plans are for you and thier daughters future.i did this it took a few weeks and before you know it i was staying with her family.just be polite and ignore any negative things they might say to you just agree them my wifes dad was the hardest he was not happy but he came around 6 years later good luck i know this isnt legal help but figured i would share