We are following our instincts, but your opinions and suggestions are more than you could know, appreciated!

Wow you need to put things in perspective.Have your mother in law and her husband meet you at a therapist office and discuss every fear you have. Don't hold back on your allegations of the step dad.Make sure you write down the list because when there is light on the entire situation and the step dad still refuses to talk then silence might be the guilty not speaking.When your mother in law tries to guilt you then turn the table she married someone of ill repute and you and your husband are adults not minors and do not owe her or her husband anything.If she doesn't like it tell her to take you to court for her grandparents rights.My guess is she will back down from the truth.There are disgusting people in this world maybe you are crossing paths with one.A third party needs to be involved simply because they aain'ttaking sides with family simply helping you decide whats what while your child remains safe and pretty clueless.