#wash figures out that he's lina's older half brother after epsilon and that's why he's kinda awkward in present day s10 bc he's not really

[tvckerwash]

I personally like carwash half siblings that don't know they're related, and in this specific scenario wash is actually the older sibling (bc he is most likely older than carolina in canon based off the washed hands interview lol).

allison had wash before her and the director were a thing (or they were on an extended break or something lol) but since she was so early on in her military career she didn't want a kid yet, so she gave wash's dad full custody of wash immediately after his birth and then peaced out back to earth.

she never told leonard about wash, and it's by chance that 2 decades later when he's going over potential recruits for pfl with price that he sees wash's picture and just stops because he's memorized allison's face and he sees the ghost of it in this random ass guy. he has her smirk, her nose, and he even bleaches his hair the same shade of blonde allison bleached hers.

so he does a little digging under the guise of a standard background check, and he discovers that this young man has allison's violent temper, her strong beliefs, her long memory, and during price's interview with the him, he learns that he's a hell of a lot smarter and far more aware of whats happening around him than he makes himself out to be, just like allison was.

so the director chooses david to be one of the 50 recruits for his experimental program in spite of price's hesitancy—the young man is more than qualified skill wise, and his circumstances will work greatly in their favor (or that's what he tells himself at least).

one secret dna test later thanks to the standard medical evaluation upon entering freelancer, and he confirms what he's suspected for the last year or so: david is allison's child, and much like with his own daughter, the director is determined to hold on to this fragment of allison.

carwash sibs is such a funny concept bc there's absolutely nothing in show that even slightly suggests wash and lina are possibly related, but we all just kinda went "haha but what if they were siblings?!?!" and went from there