The Trustee of the Trust has dementia, so her son is the Executor

[Sheery Ann Lariba]

The Trustee of the Trust has dementia, so her son is the Executor and has Power of Attorney. To do a self-closing transaction for the purchase of the vacant land lot, should I prepare documents where she is a Grantor and he just signing documents for her as an Executor?

Or there should be something more complicated involved?