Do hope this makes sense.
They have Charles born in NSW. 1890? He and his mother are in Ireland in 1911. Charles marries first wife in England 1918
His mother Meta and Charles's first wife, emigrate to Australia in 1918. She must have been in Australia before 1918 to have Charles
.
I am still looking for Meta Sophia's marriage details to a Willam Henry JACKSON - Charle's father
cupcake
Cupcake, have you done a timeline, using the information on the various records found for you?
I realise you hold that Charles was born in 1890, despite he providing his age as 23 years 1 month when he enlisted 7th Oct 1914, but that is still not going to find a birth in NSW for Charles Robert JACKSON in either 1890 or 1891.
Way back I provided the index info for the first marriage. May I ask again if you have any thoughts as to what the initial "S" may stand for?
Perhaps it is a SURNAME that may help us to help you, afterall, by inference you may well be suggesting that Meta had Charles prior to her marriage to William JACKSON, and IF so, then it is unlikely to find Charles NSW birth under that surname.
Cheers, JM