Hi Kay,
Sorry to say there are no burials for them on find my past.
I did find their death registrations and census returns.
I noticed that Ann Maria Wood first married Josiah Allsop and after he died George Howell. Her death index was in the name of Howell.
Ann Maria and Sarah were both registered in Kings Norton, Worcs.
That ties in with the 1881 census address of 81 Bristol Rd, Edgbaston.
As this is not far out of the city my guess that they would not be buried at St Mary's, Selly Oak, more likely St Marys, Whittall St or Key Hill Cemetery.
As for John, I could not locate him in 1891/1901 but his death was registered in Birmingham, so he was probably buried with his mother?
I note his brother Frederick married and moved to Glasgow, he then like John became an Artist.
It might help if you posted your request on the Birmingham History Forum. They may have someone who could do a look up for you.
http://birminghamhistory.co.uk/forum/loginIf I can be of any help please let me know.
Regards
Colin