Hello StatenIslandAgent, and

It sounds like you've turned your relationship into a success story for your marriage and family.
It's sad that your siblings-in-law are still enmeshed with their mother. Though I had prevously "diagnosed" my Ex's father as exhibiting BPD traits, I realized that my former MIL was the one who may have done covert incest towards her daughter, to replace an abandoning (abusive and serially cheating) spouse. I never used the phrase "emotional incest" but my Ex came to realize it on her own.
Before I came to this site, I would have taken for granted the stereotype of a "momma's boy." Now I realize that my Ex was like that in similar way ("married to her mother?" I often thought).
It sounds like things are going well now. Do you have recurring boundry issues with your MIL though? If so, how are you dealing with them?
Turkish