Hello bkk125,
Welcome to Rootschat. Unfortunately, little George was interred in common ground, this means he was put into a pauper's grave and headstones were not allowed to be erected at such graves. As far as I can see, there are about 9 babies, (about 5 were stillbirths) and one adult in the same grave, all unrelated from what I can tell and all of them buried there within the space of 2 weeks.
I've had a look through the burial records and can't see any other children of George and Jane. I've also searched for George who died 17th April 1891, he is not in a private lair and the records of paupers burials for 1891 have not survived. Same with Jane I'm afraid.
Good luck with your research.
Lodger.