Single word expression for "having the same source"? [duplicate]

Solution 1:

coöriginal or cooriginal (not comparable)

(philosophy) Existing together ab initio; equiprimordial.  

(geometry, of a line) Originating from the same point in space.

Wiktionary

Solution 2:

Consider "concomitant" and "coincidental."

concomitant: happening at the same time as something else.

coincidental and coincident: existing or occurring at the same time; occupying the same space or time.

To know the truth and to begin to know that you know the truth are coincidental.

Solution 3:

Why not something like one of these:

1. entwined
2. twinned
3. inextricably bound

Yes, I realize the third choice there is two words.

Solution 4:

• contemporaneous: Existing or occurring in the same period of time.

• coeval: Having the same age or date of origin.

• concomitant: Naturally accompanying or associated.