Well this is most intriguing! Using the info you had already sent we discovered Edith's mother, Selina was a twin so it is very possible Edith had twins also. I shall send off for a copy of Rene's birth cert to check- however if she was adopted also, I think I shall get no further for I think only adoptees can follow up on their adoption papers and I won't be able th check for her new name.
Thanks again for your help. Wouldn't it be lovely if someone reading this sometime recognises the family! Pat