I've been doing a lot of thinking lately, mostly due to the fact that I've disengaged from both SD10 and SD15. Initially, I had only planned to disengage from SD15. However in lieu of recent events/changes in SD10's behavior (mimicking her sister's behavior to a tee) I found it a lot easier to disengage with both.

Here is what I did:

-Reminded DH that in the recent past I had told him that if the SD's bad behavior and disrespect continues, I would disengage from one or both.