The daughter Maria Georgina's baptism has all the clues you need
Baptised 24 Sep 1892 in the Parish Church of Ironville with Codnor Park
Father: Thomas WALLIS,
SoldierMother:
Nellie WALLIS
Abode:
LondonThomas has a Service record:
* Thomas WALLIS age 18 years and 6 months.
* Army Number: 9550
* Joined Grenadier Guards at London on 7 Nov 1884
* Born Codnor Park, Alfreton
* Labourer
* Not Married
* Has never lived outside of his father's house.
* Had previous militia service 3rd Btn Derbyshire Regiment
* 5',8" tall, Fresh complexion, grey eyes, brown hair.
* Religion Weslyan
* He was appointed, promoted to Cpl then Sgt and extended his 7 years service to 12 year with Colors. Then around May 1892, he went off the rails for that whole year- absent, jailed, trialed, convicted and demoted and so on. Finally discharged 4 Nov 1896. He served the whole time at "Home" - ie in the UK.
NOK was listed as his father, Thomas . It was never changed to his wife's name, nor any notation regards dependant children.
In 1891, he was probably somewhere in London or in a hospital in Woolwich, or in Dublin - more likely the latter. It looks like the London & the Woolwich times were all around April 1890 whilst he was being treated for his.....ailment. By 5 Dec 1891, he was in London again, after Dublin.
Cheers
AMBLY