I am sorry it's happening. Hopefully it's just a glitch and they will be ok again. Divorce or even separation is hard on everyone involved. So I hope it's not serious and they can work on stuff.

Saying that, I am sure you'll be able to manage. My daughter is well adjusted productive member of society and she was raised by divorced parents since she was 4, she is 30. As an adult I am sure you'd manage if their marriage is troubled. I'd focus on ensuring your own life is in the right place as you can't control theirs

But I do hope they can rebuild it (maybe marriage therapy?)

Hang in there!