Well see, Shag, if one of your folks cheated on the other, that would give biblical warrant to divorce if reconciliation and forgiveness wasn't possible. IF that were the case, your mom would be well within her rights to say what she did about queer marriage (assuming she was the one cheated on). But even if not - and you won't like this - it's still between a man and woman only, and even a hypothetically adulterous divorcee can rightly point that out...just because her marriage fails does not lend credence to sodomites getting hitched. Sorry.