There's a whole lot of questions that should be asked.

Regardless of who wrote the letter, why send it to the Met? They have no jurisdiction over what an American gets up to in the US or Mexico.

If it was Tom Sr's first wife, it makes even less sense to send it to the Met. The woman has grandchildren (and possibly even great-grandchildren), yet her first concern is the safety of the unborn child of the daughter of his second wife?

Nobody in the family acts out of altruism. They all have an agenda and form alliances based on the belief that "my enemy's enemy is my friend" until joining the other side looks like it would be more beneficial.