Family trust

We have a family trust that both parents died but did not sign the trust form to transfer the property. Only the short form was signed and recorded. Two of the family members who are the trustees insist that a trust exist and have transferred the real estate assets from the trust to one of the trustee through a quick claim deed. The trustee was listed on the distribution form to receive the property with life interest and the other two family members to have equal share upon death. Should this problem be settled through probate since the long from was not signed or recorded.