My father (deceased) had children from a previous marriage. His ex cheated with several men, he left, she told her kids lies about my mom when he remarried. I recently reconnected with my half sister "Sandy" on Facebook and wanted to invite her to my wedding, so I sent her a Save the Date and a link to our wedding website. But when my mom saw her name on the guest list, she started crying.
Turns out Sandy has been sending my mom nasty e-mails and accusing her of all sorts of terrible things (stealing my dad from her mom, getting an abortion, etc.). My mom doesn't want me to invite her and she's very distraught by the whole thing.
What do I do? She has the save the date, so I don't know how to un-invite her. But I don't want her causing drama at my wedding or hurting my mom! Advise please?