'Someones' jacket

We were at the park tonight and it was time to go so Grandma Jolene says
"Hey is that someone's jacket over there?"
Jerzi and Abby at the same time say "Ya"
So Grandma says "Well whose is it"
Jerzi and Abby at the same time again say "I don't know"
Ha Ha Ha! Well they were right, it was 'someones' jacket, they just didn't know whose!! I love 4 year olds, they make me smile!