yes, he has that authority. But you can file a complaint with with Adult Protective Services, and/or file to seek guardianship yourself.

I do not understand your question at all in the context of Estate Planning

You don't need to do anything to "invoke" it. Just give them a copy and do it.

HIs fiancee has no rights in this matter. You need to open a probate estate, collect his belongings, and take care of any issues such as the lease,...

You will need to file for guardianship over him.

You need to consult an estate attorney. You may need to open a probate, or simply file an affidavit of descent, depending upon the circumstances.

What you would need to provide the court before the hearing depends largely on the local rules, the court preferences, and whatever allegations are...

Unless you marry her boyfriend and adopt the girls, there is nothing you can legally do to prevent his sister's from claiming custody upon his...

You can do your Will to specifically state that he does not inherit anything from you.

She cannot name a minor as her power of attorney. Moreover, your mother as trustee has a legal duty to carry out her duties as trustee. If she is...