I can believe that BL came home and made up a story and they believed him. They seem like enablers, so I can see how BL would manipulate them.
All of this stops the second Gabby's mom tries to make contact. THEY ignored her, not BL, all of them. At that point you have to know something is up. Something is wrong. This person that lived with your family for 2 years is nowhere to be found.
I don't know how much information BL's parents had in the beginning, but as the days went on and as Gabby's mom contacted them, they had to know something wasn't right. They could've done the right thing. Instead they've been doing everything to help BL. They feel no moral obligation, no love for Gabby or her family. And at this point they can't play innocent. They can't say they are blindsided.
MOO they knew something was wrong from the second BL came home. Gabby lived with them. They had to have seen how he treated her, what their relationship was like. IMO they were/are either in denial or their own relationship is just as toxic and they're trying to cover all of their asses by staying silent.
MOO Oh, I agree with you that once GP mom contacted them they asked him and he told the truth (whatever that truth turns out to be) and then they called a lawyer and he told them to not interact with GP's family and to wait for LE to contact them and that he (the Attorney) would take it from there. From there on they have probably been having mental breakdown and can't even keep track of what day it is.
Yes, Gabby lived with them. GP's friend, Rose, is quoted as saying that GP would come stay with her (7-10 times in the short time they knew each other), whenever GP and BL fought. I also think that if BL actually did fly home in August it was because they had a fallen out and he told his parents they broke up. but then he went back. So I think it would be pretty easy to spin a convincing tale how she had left him and was spending some time with her friend.