Millie or Alma Smith-Rotherham

[Eltrick]

Hi
I'm trying to find details of these two daughters of Albert Smith.The father was born York1884.His first wife Emily died 1914 in Sheffield but his daughters Millie and Alma were I think to his second wife Annie?There was also a boy George [possibly Annies' but not Alberts]They lived on Gladys st Rotherham in the twenties but this is all the information I have.
With a name like Smith its so difficult and I dont know Annies maiden name or if Millie is short for Millicent or something else.I cant find a Millicent on the GRO's.Has anyone any ideas please.
Thank You
Audrey
P.S. Dont even know if Albert and Annie were married.