I would start with the divorce decree. To whom does it award the trust assets? Or maybe this is a bifurcated case where the spouses are declared single, but the property settlement remains to be decided. In that case, whose money went into the trust, and does the trust state that it is now owned by both?
And who are the beneficiaries? The grantors?
My guess is that you will end up with a 50/50 split.