Granted, Knuckles and Julie-Su are distant cousins. But still, them having a kid takes their family tree and turns it into a family wreath.
Long time ago there was this guy named Edmund, he was the first guardian, and had two sons.
One son became the next guardian and started the council of secret granddads that never do anything even if they could resolve every conflict in a day with no loss of life or collateral damage.
The other son fucked off to do his own thing and his descendants started the dark legion where his bloodline remained control, this is where Julie-Su came from.
Both families make a big deal about family history and bloodlines and shit. Which just makes Knuckles Kaio-dicking Julie-Su times four even weirder.
There were things in the old canon I like for sure, but thank God for the reboot.