I'm afraid i was in a similar situation years ago(well for many years)because i chose the best thing to do was lie, I used every excuse from i have already accepted an invitation to a friends, booked a holiday somewhere hot, got loads of parties from xmas eve to new year, to i am staying home with my partner (i didn't even have one at the time!!) i did this because i knew if i went home my childhood abuser would carry on groping me at every opportunity yet because of my younger siblings (who were never abused) i did not want to cause upset there. it worked for a number of years until although asked to go back it was accepted that i wouldn't be there when i could just say no. eventually when my siblings were adults i then told my mom and stepfather exactly why i would never go back, mom still thinks i am lying but he knows what he did and still denies it to everyone. Lying was the best option for me although i do understand lying is wrong sometimes you just have to do anything to survive and looking after me was the only way i could survive.