Final answer:
The form of co-ownership in this situation is Tenancy in common.
Step-by-step explanation:
The form of co-ownership in this situation is Tenancy in common.
In tenancy in common, each person owns a separate and distinct share of the property. When Pierce sells his share to Grace, she becomes a co-owner with Glen and Ryan, and they each own a specific percentage of the property. Unlike joint tenancy with right of survivorship, tenancy in common does not have the right of survivorship, so if one co-owner dies, their share does not automatically pass to the remaining co-owners.