Get a restraining order for the girls and your parents. run. don't walk!!!!
It has always bothered me that eew (or the threat of eew) has consistently ruined every birthday, holiday and milestone since she left. She's set the table. Now it's your turn to serve her the just desserts she's more than earned.
I'm sorry if that sounds mean or vindictive, but it's too much too far and she's b@t $h!t crazy to boot! your mom and dad should be enjoying their lives now, not worrying about a drugged up loose cannon. The girls have been through enough. Take action. Please.
xoxoxo
M 20+ T25+ S ~15.5 (BD) BD 4/6/15 D 12/23/16
"Someone I loved once gave me A box full of darkness. It took me years to understand, That this too, was a gift." ~ Mary Oliver