irrevocable trust

three siblings are trustees and beneficiaries of the sole asset held by a irrevocable; a second to die life insurance policy. Two siblings are suing the life insurance company and the third sibling to force the life insurance company to loan money on the policy to pay for the mother's living expanses. The mother and father were the grantors, the father is deceased. the mother is still living. looking for support to stop the loans in defense of the third sibling and the life insurance company