1.who's/whose is ann? she's my/mine sister 2.it this bag your/yours? no,it's sheila's/sheila 3.who/whose dog is this? it's their/theirs 4. are those balls your/yours? yes,they're our/ours 5. who's he? tom's and julie's/tom and julie's father

1.whose is Ann?  She's my sister
2.It this bag yours? No,it's Sheila's
3.whose dog is this? it's theirs
4. are those balls yours? yes,they're ours
5. who's he? Tom and Julie's father