I am sorry. It’s painful.

You can’t make other people to apologize though or do anything else for that matter. If apology is important to you but you can’t make them to, you might have to estrange yourself from them completely. Or you can try to mend it without apology. Or they might eventually apologize but maybe it won’t even be sincere (your mom knows now that you want them to apologize so she might ask them to do that).

Apologies aren’t always sincere. It’s all words. My brother once apologized to my dad for something he wasn’t even guilty of, he did it because mom asked him as to keep peace. Apology meant nothing as my brother did it for our mom. Your sisters might apology to you to keep mom at peace not as much feeling bad offending you.

I am sorry about your divorce. I knew you weee divorcing but I thought you two were back together. It must be hard