Yes.
You have the option to add as many trustees as you please.( read more )
The user may appoint his/her heir as a trustee.
It is important to note that, in this case, the heir who is also a trustee may, by force of his or her position as trustee, view the messages before the predefined triggers.No.
Once you appoint a trustee, he or she will receive an e-mail notification of his or her appointment and will be required to confirm his or her acceptance of the role.