Some updates as more records have appeared online or have recently been found.
Ecclesiastical court orders for two of the illegitimate children as Jessie's father was in Ireland with the British Army Jane appears to have not used the IOM court and gone straight to the army or at least the absence of Jessie in these records points to that being so:-
Robert Mylchreest Gregg
familysearch.org/ark:/61903/3:1:3QSQ-G99J-1SWD?i=2&cat=2031034
Euphemia Mylchreest Chapman
familysearch.org/ark:/61903/3:1:3QS7-899J-1JH?i=4&cat=2031034
Jessie Shone's burial record 1918
familysearch.org/ark:/61903/3:1:3QS7-8924-P4R?i=413&cat=1027117
Robert Gregg’s obituary mentioned a sister called Catherine Marsden in Fleetwood. Catherine appears in Fleetwood on the 1939 Register. She married Oscar Cedric Horace Marsden at St George’s Douglas on 3 Feb 1913. She is indeed the half sister of Robert, daughter of Robert Gregg and Elizabeth Catherine Quirk. She died in 1966.
Robert Gregg married three times in the USA. I haven’t found his first marriage record. Second has father as Robert Gregg born Whitehaven England and mother as Jane Mylchreest born Braddan Isle of Man. Probably didn’t know that Jane was born in Malew. Third has father R Gregg born England and mother as E Mylchreest born Isle of Man. Jane was Eliza Jane so that might explain the initial E. Death Certificate not online records go up to 1960 Robert died in 1963. Death Index record gives some brief details such as Mother’s Name: Mclyeres.
Other records found for Robert apart from US Census records: 1907 travel records, US WW1 and WW2 Draft records, Naturalization papers, Declaration of Intention 1935 (no photo) and Index Card 1938.
One candidate for Euphemia is Euphemia Poynton of 33 Mark Street Manchester on the 1939 Register. She has the right date of birth, 24 Dec 1889. Died 1972. There was a Poynton/Mylchreest birth in Chorlton in 1920 but I haven’t been able to locate a marriage for the parents.
Col