He was born Gerald McEllistrim BROOKS on 21 Dec 1908 Cardiff, Glamorgan Wales
Parents: Isaiah BROOKS and Julia McELLISTRIM who married 10 Jan 1895 in Tralee, Co Kerry Ireland.
He was the 7th born and 6th surviving, of 8 children born to his parents.
First he dropped the BROOKS & went as ELLISTRIM, prior to or around 1930 (possibly at the time he went to sea)
Then he dropped ELLISTRIM and assumed MONTRIO from around 1936 onward after he arrived in US as an emigrant.
Though he had been to the US as a ships crewman as early as 1930, he emigrated formally the US in April 1936 on the ship, "Steel Scientist". He appeared on the Crew List as Gerald ELLISTRIM as an Able Seaman from Singapore to NY. On arrival in NY, he was formally discharged as crewman Gerald ELLISTRIM and then listed on the list of disembarking Passengers as a visa carrying Gerald McEllistrim BROOKS, Contruction Engineer. He applied for US Naturalisation later in 1936 under MONTRIO but on the petition, declared himself as having arrived in April 1936 Gerald McEllistrim BROOKS.
NOTE: The same question about Gerald was posted on Mutliple Boards! I'm linking them all up, to avoid anyone else doing what I just did - spend heaps of time on research to try help (via the Falkland Island Board) only to later find r the other posts and some duplication of effort on other boards (the ones marked **)!
** Wales, Glamorganhttp://boards.ancestry.com/localities.britisles.wales.genera...
In addition - Francesca as posted a message about the parents and siblings of Gerald, here (where I am about to add some information):
USA General - re: BROOKShttp://boards.ancestry.com/localities.northam.usa.general/29...
His father Isaiah (age a bit out) enlisted for WW1 in Wales:
1914: WW1 Military Service Record
#13988 Isaiah BROOKS age 34 & 300 days
Attested 21 Sep 1914 for the Royal Dublin Fusiliers, at Pontypridd, Glamorgan Wales.
Saw active Service overseas
Discharged 7 Sep 1916, no longer fit for Service
Discharged to 5 G------ford St, Cardiff (Wife was also at one point at 5 Belle Vue, Cardiff)
Particulars of Marriage:
Isaiah BROOKS & Julia McELLISTRUM (maiden surname) , married Tralee (Co. Kerry, Ireland on 10 Jan 1895. Witess: Arthur E RAILES & Johanna Mary RYAN
Particulars of Births
Eileen Catherine Mary born 14 Jan 1901
Marie - born 3 July 1902
Stephen Finbar - born 29 Apr 1904
Gerald McEllistrum - born 21 Dec 1908
Pauline Julia - born 4 Dec 1912
Note the births are only for the dependant children he is legally supporting at the time (they are listed for pay, pension purposes) - the older children not listed as they are not counted for this purpose. This is also the reason his marriage details are listed, to validate his dependant wife for pay/pension.