Additionally, In December, 2018, my brother "helped" my mother change all of her legal documents. He is now her personal representative, her PoA for health care and finance, and receives her house via ToD. Previously, he appeared on none of those documents. About three weeks ago, my brother showed up and began "helping" my mother change all of her financial accounts, presumably to include him. He also contacted the Passport Renewal Agency. He admitted last week that his plan is to take her (and presumably her money) back to England with him.
It rather appears to me that the brother is going for a money/asset grab, and nothing about Mom's well being.