Welcome to our forum.
It is exemplary that you're putting in the research and giving your sister's relationship change a chance. Not all sisters would be so lucky! Hopefully you'll be able to find the answers to any questions you may have here, and don't hesitate to ask if something's on your mind.
Sounds like you've enjoyed your stay so far; I'm glad I could meet you here.
Love means never having to say, "Put down that meat cleaver!"