According to Stephen Amell who plays Oliver Queen on Arrow, during an interview with Screen Rant, Oliver will in fact meet his son Connor Hawke, that has been teased for sometime now on series.
This is what Amell had to say on the topic:
“Me personally being a dad, I would love to see how Oliver interacts with having a kid. Obviously, it would be a different experience from that experience, but I think that storyline deserves further attention. One of the big tenants of Greg Berlanti is you don’t introduce something to the audience, you don’t tease it if you are not going to follow through with it [in] some shape or form. So I think it’s a safe bet that Oliver will find out about his child at some point.”
In the comics Connor Hawke is Oliver’s son from a previous relationship with Sandra Hawke, whose character has appeared on Arrow and The Flash, Oliver later meets Connor as an already grown adult and ends up becoming his sidekick and at some point in the comics he also becomes the Green Arrow.