And depending on how much you care about paternity issues, they straight up delivered.
Spoilers for "The Flash" and "Arrow" past this point.
Oliver Queen (Stephen Amell) is officially a daddy!
Last season on "Arrow," a flashback before Oliver's time on the island showed that the (at that time) playboy billionaire had impregnated his girlfriend. To handle the problem, his mother Moira Queen (Susanna Thompson) paid off the girl, getting her an abortion and sending her out of town forever.
Turns out that the "out of town" was The Flash's home-base of Central City. And that she never got rid of the baby.
Oliver bumps into her at CC Jitters, the bizarrely named coffee shop the gang hangs out in on "The Flash." He says hello, she offers condolences on the death of his mother (last season on "Arrow"), and they part ways.
Then she calls someone on her phone, and promises to bring her kid hot chocolate, totally ignoring the fact that it'll probably be cold by the time she gets home, but whatever.
Instead of matters of temperature, let's talk about how a kid might heat things up on "Arrow."
We'll ignore how this might affect #Olicity for the moment, because they're in the middle of a staring contest:
The biggest thing to note at this point is that this kid is six or seven now, given the show's timeline. So it's not like we're going to see a rogue teen archer tracking Ollie back to Starling.
Having a kid in general would definitely mess him up - and it means that everyone on Team Arrow is a parent except Felicity Smoak (Emily Bett Rickards). But also, traditionally adding a kid to an adult, soapy show like "Arrow" tends to screw up the narrative.
There's always the possibility on a show with mild sci-fi elements that the kid could prematurely age -- see "Angel," et al -- but again, this doesn't seem like a likely possibility.
Could Kid Arrow show up on "The Flash?" Maybe. His or her appearance wouldn't have the same emotional impact, but "Flash" is far less dark and more kid friendly than "Arrow," so it wouldn't knock the show off kilter in the same way.
Regardless of how this plays out, the kid is confirmed. He/she exists, and it's something that will have to be dealt with at some point. The question is, how will this latest round of secrets and lies perpetrated by Oliver's mom affect him this time?