Tenaya was a spy for the Germans in WWI but defected to the US with help from her American brother, Dillon, and has since been pardoned. Along with her brother and his girlfriend, Summer (the flapper daughter of a business tycoon in the city due to lose all his money in the Great Depression, and who had also helped in the war effort), she travels around in his beloved car.
Devlin's father was in prison, with his mother either dead or deemed unsuitable to raise a child have not worked that out in fanon, so he was sent on an orphan train (http://en.wikipedia.org/wiki/Orphan_Train) to the West. Not agreeing with that idea, he escaped to the city, where he worked as a newsboy and befriended the son of Chief of Police, Ben Tennyson. When Devlin's father escaped prison and came to the city, Devlin first went to try to reunite with him but discovered his father really didn't want him, so he helped Chief Tennyson arrest him, which endeared the Chief to the boy. Seeing that his son really was good friends with the paperboy and owing him his life, he managed to adopt him.
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Devlin's father was in prison, with his mother either dead or deemed unsuitable to raise a child
have not worked that out in fanon, so he was sent on an orphan train (http://en.wikipedia.org/wiki/Orphan_Train) to the West. Not agreeing with that idea, he escaped to the city, where he worked as a newsboy and befriended the son of Chief of Police, Ben Tennyson. When Devlin's father escaped prison and came to the city, Devlin first went to try to reunite with him but discovered his father really didn't want him, so he helped Chief Tennyson arrest him, which endeared the Chief to the boy. Seeing that his son really was good friends with the paperboy and owing him his life, he managed to adopt him.