Her great grandfather had 3 children. I have 2 copy birth certificates from GRO; her grandfather, mother's maiden name Alice Maud Groves. Two years later another sibling, mother's name Alice Maud Parry. Doesn't make it any easier. They are both on the 1911 census. Alice Maud born in Poplar London. There are literally hundreds of Alice Mauds born in Poplar around the birth date for her on the census. The father is shown as married to one of the Alice Mauds although he apparently never married either, and one of the Alices eloped with a lodger as he was a bit of a wife beater by all accounts. His name I think, was Clifford Walter Smith, but apparently was known to all as Walter. I'm struggling to find out much between 1911 and when he died in 1951, but hoping for help from a relative. He was supposed to live in Bootle but I can't find him on the 1939 census or any electoral registers.
That aside, the point of the post was that in 1916, there was another child born, Walter Smith. GRO has no mother on the birth certificate, so maybe Alice number 2 had done a runner, or he had another companion. If I order a copy birth certificate from GRO, presumably it will not have the mother's name on it, but still should have the father and his occupation (dock labourer)?
Time for 2 paracetamol

Thanks, John