Aaron Kelso, the owner of the store
Kelso's Corner Store is the after school hang out place for all the kids at Third Street School (except for Conrad Mundy, Greg Skeens, and the Lazy Kid, all of whom have been banned). As of 1997/1998, it has been running for 42/43 years (since 1955).
You can buy a treat or a toy there. The store is owned by and named after Aaron Kelso.