Can my fathers wife spend her trust however she wants?

Father-in-law left a living trust for his wife, stepmother, with my husband and 2 sisters to have the trust divided when she passes. She remarried. Can her and her new husband spend the trust funds however they want? Is it contestable? Also, how would we find out how much his portion of the trust is? My husband has been really sick for a couple of years now, we don't have health insurance and also wonder about a hardship withdraws. We could get a doctor statement.