I shall list what I do know:
Annie Coughlan DOB 22 July 1894 (this was taken from the 1939 census)
Baptism of Annie Coughlan 18 Jan 1903. Parents listed as Michael and Elizabeth Coughlan of 80 Eugenia Road (Church St Katherines, Rotherhithe). Annie's brother John William (1898) was also baptised the same day.
Michael & Elizabeth (nee Deamer) were married 18 Feb 1895.
Elizabeth Rebecca Deamer is listed as a spinster living at 60 Fawcett Road.
Elizabeth Rebecca Deamer, spinster of 60 Fawcett Road, also married John Joseph Bowman (of same address) 18 April 1892.
I believe Elizabeth Rebecca Deamer was born in Erith, Kent on 7 March 1872. She appears in the 1901 Census but not the 1911. Michael Coughlan is listed as widowed. I cannot find her death certificate. Father James, mother Martha Bowman.
I believe John Joseph Bowman was born about 1872. Father Samuel (mother poss Sophia). I cannot find a death certificate for John Joseph Bowman that seems to work with dates.
To recap, I cant find a birth certificate for Annie Coughlan, a death certificate for either Elizabeth Rebecca Coughlan (nee Deamer, previously Bowman) nor John Joseph Bowman.
I am wondering if the Bowmans were related - no idea on the rules for marriage in those days.
A fresh pair of eyes on this might see something I am missing, or advice of any type. I have been going round in circles.
I have copies of various certificates/pdfs. Let me know if you want any.