All anyone ever talks about is who Ash's father is, but we also forget to think about Gary and Professor Oak.

Professor Oak is Gary's grandpa, so that means that Professor Oak must have been married at one time and had a child. Then, that child, who must be Gary's mom or dad, had Gary. So, who are Gary's parents and who are/is Oak's children/child?

On the Gameboy, Gary has a sister, which could mean that Gary has one in the Anime.

Anyone have any ideas?