First things first, don't bow to false idols..it's a biblical thing for the chosen people.
Frank, dude you have been in your head for so long I think you have forgotten how to find your way back to the temporal lobe so you can get out.
If your STBX is saying some of these things to your kids and you are not doing anything about it, there is a problem. You have an obligation as their father to: 1. listen to them 2. Counsel them 3. defend them
As their dad you do not get to pick and choose which of the 3 you want to do and when. You just do them all. If your STBX is laying guilt trips on them, they need to confront her and tell her to stop it. You have to teach your girls to stand up for themselves even if it is their mother. She sure as hell counseled them to confront your alcohol issues. One of teh few kudos I have given her. If your girls confront her and she continues the negative behavior, then it is your JOB and RESPONSIBILITY to confront her yourself and teach her that you will not tolerate emotional abuse of your girls.
I will also caution you on one other thing here as I am seeing some signs that are sending up some big asss red flags. You have teenage girls, and what are teenage girls great at???? Got it yet?????
tick tock tick tock.......
Thats right Frank, manipulation. Teenage girls can sense that dad seems to be a little more loving and supportive when they bitch about mom. Teenage girls can see that dad overlooks some things when the girls are "upset" by moms behaviors. Teenage girls understand that that playing the sympathy card on dad makes life work for them.
Be careful Frank, I know your a good dad, I get that you are being a concerned father, but I wonder if you may be getting played a bit here.