Board Thread:Spoilers!/@comment-31937823-20180405010135/@comment-1916997-20180502224500

Regarding Robin, Zelena's daughter, at this point, if Neal is about 10, then I guess we can assume Zelena and Robin went off somewhere where 1 year in SB was 10 years or so in that realm. So if Zelena left with Robin shortly after the Season 6 ending, and Robin aged from 1 - 10 there in 1 SB year, and then came back to SB where she aged normally the remaining 8 years, this also explains how she knows all about LWM stuff. Then they went off to the NEF (as we saw), where again time moves quicker than SB, so that is how we get to 25 in present day, with Neal only being 10.

Regarding Robin, Robin's father, here is what the tease was, incase someone doesn't want to go to the site:

Do you have anything on Sean Maguire’s return to Once Upon a Time? —–Sara Lana Parrilla told me it was “a complete joy to have Sean back and to get to tell the Regina and Robin story again,” as the ABC series nears its very end. “I just love working with him, and I know how excited the fans will be when they see one of their favorite couples reunited.”