the tree on Ancestry has Elsie Winifred Mary with a father and mother named, which has to be wrong, as no mothers maiden name listed on GRO, there is another Elsie Winifred in the area, so perhaps the info relates to her.
Hence the importance of checking thoroughly. I found the children on census, then looked for the births.
Looks as if they put grandfathers name on marriage certs, must have brought them up.