The person-indexing construction (Possessor-pronoun-possessum) is rare. Since the 3SG pronoun is gender-neutral, and since there are no instances with a 3PL pronoun in the data, agreement of the pronoun with the possessor cannot actually be established.
Juxtaposition of possessor-possessum appears to be restricted to cases where the possessor is human.
Source: SPT 1762: 180
Source: Schumann 1783: 128
Source: van Dyk ca. 1765: 29
Source: Schumann 1783: 191