Thank you, alli. That does look like the children!! You are probably right that George remarried , then died. I haven't been able to find the marriage or death to confirm this yet.
I found a burial for a George Onions that I think was probably not him. This George Onions was buried August 19, 1832, age 41, at Bilston, Swan Bank Wesleyan Methodist. That was the week before Diana was buried but she was buried at St. Leonards, Bilston.
I suppose Mary may also have been a spinster aunt.
Regards, Susan