Pre-Crisis:
Anthony Gordon worked as a counselor at Camp Smallville while his little sister Barbara was a camper. The two of them had quite a few adventures at Camp Smallville. Barbara almost drowned and was saved by Superboy. She later got superpowers similar to Superboy’s and even fought him as Mighty Girl before she lost her powers.
Post-Crisis:
He no longer exists in Post-Crisis continuity, instead being replaced by James Gordon Jr.