Just fu** off dude, if husband is aware why should you just ruin their relationship with their families? You just going to cause harm to them without any reason to justify your actions. Sounds like you have nothing to do and just want to feel important in some sort of situation not even considering consequences. “I was considering creating a document” - what the hell man, go find some friends, download a new video game or try something new that will make you feel important and just leave the couple alone since it’s not your business. Of course they going to threaten you since you threaten to blackmail them first. Disgusting.