Unless the trust provides otherwise, co-trustees must act unanimously. Refer to Probate Code §§16013 and 15620. However, the trust can allocate
powers unequally between co-trustees. And, in limited circumstances if a co-trustee is unavailable, the remaining co-trustees may act. Refer to Probate Code §15622. If the co-trustees are stalemated on a decision, one or more of the co-trustees can file a Court petition for
instructions. Refer to Probate Code §17200
A co-trustee can be liable for a breach of duty by a co-trustee. Refer to Probate Code
(a)-(b). Thus, if a co-trustee takes an action that the other co-trustee believes is a breach
of duty, the non-breaching co-trustee should consider filing a Court petition under Probate Code
Hostility between co-trustees can be a ground for removal of a
trustee. Refer to Probate Code§15642
This certainly might apply to your case since they are not agreeing to include you and work together.
If you were opposed to something here that they did without you have right to petition the court s I set out above and seek removal of other trustees.You have rights to be involved and to involve the Superior Court if you have to here for oversight.