New standard answer to nutjob sister "my relationship with dad is my buisness not yours"
New standard answer to mom "nutjob sisters life is a result of her choices and I choose not to be involved with it"
New standard answer to non-nutjob sister "your relationship with nutjob and mom are your buisness but I'm done"
I like it!
I have a relationship with my dad, but my brother doesn't. My dad comes up in conversation every so often, just because it does, and thankfully my brother just treats it like he would act if I brought up a stranger. Honestly most of the time it's DS saying something (though that hasn't happened recently as my dad hasn't been seen in a couple years and DS is forgetting him).
I used to try to bring htem together, but it was so unhealthy for me. So if I bring my up my dad around my brother, that's OK...and if my dad brings up my brother, that's OK, but I"m not going to be a middleman and try to explain things to the other any longer.
If you don't want a relationship with your mom, I'm sure you won't make Jen and Lisa not talk about them, and that's what Jen should be doing when you bring up your dad. You each have different memories and experiences, and sholdn't have a huge reaction to the parent being brought up.
It's funny, how different reactions to parental junk are, from the oldest to the youngest kid. My husband has been dealing with the inexplicable thoughts and opinions that his little sister has...and my brother sees the stuff between our parents through a tiny child filter while I have a few years more info/knowledge/understanding. The youngests, in our experience, really get set in what they believe happened, and won't listen! (even while the oldests/olders can understand where the youngers are coming from)