There's a baptism record for Robert C Yates
Baptism: 11 May 1881 St Bartholomew, Salford, Lancashire, England
Robert Cobbett Yates - [Child] of George Edward Yates & Charlotte
Born: 25 Mar 1881
Abode: 1 Dailey Street
Occupation: Cricket Bat Maker
Baptised by: G. W. Petherick
Register: Baptisms 1879 - 1881, Page 185, Entry 1480
Source: LDS Film 1786460
I looked for a possible marriage. Nothing on Lancashire parish clerks but there is a marriage on freebmd
Marriages Jun 1880
Tudman Charlotte Ellesmere 6a 1259
Yates George Edward Ellesmere 6a 1259
This doesn't help you at all with Minnie but does show that the family on the census has moved around in the past so could reasonably have moved to Doncaster at some point.