There are questions about whether Mary has ever even met DJT. There are seemingly no pictures of them together.
These family things involving estates can get ugly. I recently went through that with a family farm and 5 co-owners.
Another client had to sell one of the three family farms just to pay the estate taxes dues. Their small town lawyer, against my recommendations of life insurance to pay future estate taxes, recommended no life insurance, 10 years later they now have a huge bill due.
People want to “avoid probate” by putting multiple people on beneficiary deeds. Ridiculous.