Beyond that, the going is sticky. Husband and wife are one. I give my property to Roxy Russell. It turns out there are two Roxy Russells, both Airedales, one dead. The upshot of all this is that if you have written well, as precisely as can be, the opportunities for misunderstanding and creative misinterpretation are restricted.
Precise writing is a discouragement to fault finders.
The argument is endless. If you can, try to make sense out of a writing. The agreement is ambiguous. In one sense horse is a general description that includes a mare. In another sense it means only gelding and stallions, not mares.