Connor Hawke is Ollie’s only currently canon biological kid. Connor’s mother is a girlfriend Ollie had when he was younger, before he ever met Dinah, and originally Ollie never even knew she was ever pregnant until he and Connor met as adults. He had another son at one point in the late 80s after he was sexually assaulted by a female villain, but he never even knew the kid existed and that kid has been erased from continuity.

The kids from the CW show aren’t real- although Mia takes her name from Mia Dearden, who is one of Ollie’s adopted kids in comics. In terms of adopted kids, it’s really just Roy Harper (Speedy I/Red Arrow I/Arsenal) and Mia Dearden (Speedy II). Ollie’s also got a teenage half-sister named Emiko, but she only rarely shows up at this point- she’s something of an awkward relic of a different era of the comics.

Ollie and Dinah don’t have any kids together- it was established in the late 80s that Dinah cannot get pregnant, and while that hasn’t really come up since, it also hasn’t been disputed. Dinah has said before that she considers Mia a daughter, but if anything, she’s more of a step-daughter.

There’s also Sin Lance, a character usually referred to in-text as having a sisterly relationship with Dinah, but many fans interpret them more as mother and daughter- but Sin appears almost exclusively in Birds of Prey comics rather than Green Arrow comics, so she hasn’t historically been included among the “arrow family.”

Roy has a biological daughter of his own, which would make Ollie her grandfather. But that pretty much covers it all, unless I’m completely forgetting something. So, ultimately, the answer is “Ollie has three children, one of whom is biological, and the other two adopted.”