Once a veteran has passed, can the ex spouse draw DIC or other benefits? The ex spouse remarried but divorced again.

Yes, my brother’s ex wife did so. I don’t know the exact details. I just remember being surprised that she was able to do it.

She collected before she divorced my brother. I suppose it is determined on an individual basis.

No most likely not.

Possible, but there are specific criteria to be met. Check with VA for specific criteria.