The Flash season 9 will update fans on what has been going on with Oliver and Felicity's family since Arrow's ending. Stephen Amell was the first superhero of the Arrowverse, with the DC Universe at The CW being named after Arrow. Throughout the years, many new heroes and shows popped up in the Arrowverse, with Amell's Green Arrow bowing out of the universe after dying to save it during the Crisis on Infinite Earths crossover. Oliver met with his wife Felicity in the afterlife at the end of Arrow's series finale, with the family's current status being addressed during Amell's Arrowverse return in The Flash season 9.

https://screenrant.com/flash-season-9-oliver-felicity-update-stephen-amell/