well i hate to do it but

truth bomb .........remove all the filters and all the restraints u impose

u caught your dad doing something tell your mom ......u caught your mom checking out the neighbors tell the dad

when they are all upset and yelling slap down the paper work on the table with what ever they say u have and go next time i tell u something and u act like that same thing happens truth bomb

then turn around walk out say call me when u are ready to talk i can use some help here and leave it at that

it will shock them and get them to accept what is going on or it will force them to bury head in the sand even more .....but it is the most extreme answer if this does not snap them out of and get them to look at the paperwork and help u ......they are never going to come around