Found George F. Murrell aged 10 yrs. on 1901 England Census in Heigham, Norwich, parents Charles & Charlotte Murrell, 6 siblings, so that fits with Isabella going to Norwich in 1920.
1911 Canada Census shows him as Boarder, aged 20, Butcher, (emigrated 1910) at Dist. 125 West Toronto, address 29 Fuller (?).. can't interpret St. name.
On her trip to and from England in 1920, how do we reconcile age of youngest child George (4 mths. out and 9 mths. in) with death of father George in 1918?

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Isabella didn't waste much time getting married (Nov.1920) to next husband - guess women in those days needed someone to support them, and their children.
Just struck me - maybe the baby George was premature child of future husband Wiles? Altho. that wouldn't have gone down too well with Murrell in-laws in Norwich!!