I think of a scion as the young descendant of some noble family. I was curious about its origin and I looked up the etymology, and it says “c. 1300, “a shoot or twig,” especially one for grafting, from Old French sion, cion “descendant; shoot, twig; offspring”
The second meaning in the figurative sense that I know the word, is from the 1580s in English.
I checked the meaning of scion in a dictionary, and the first meaning is ‘a young shoot or twig of a plant, especially one cut for grafting or rooting.’
Also, that the origin of scion as something split off from something is also in the origin of the word chink.
In The Apple Tree 