The following ESL resources are available for Possessives:
General English course books (adults)
Mark Hancock Annie McDonald
Photocopiable resource books
8 - Possessive 's Page 8 Info gap. Pairwork.
Ss complete info gap task with family tree and pictures.
'Mary is Michael's aunt' etc.
Grammar books with exercises
Mark Nettle Diana Hopkins
General English adult course resource packs
9 Who's who? Page 9 Students ask and answer questions about family trees