Rumours that another member of the Braxton clan could join Summer Bay have been circulating for some time. However, show bosses have yet to confirm the news.
Pondering the possibility, Ewing told TV Week: "Who knows? I heard there might be a sister or a brother."
He added: "There is certainly more Braxton family that the Bay hasn't seen yet. They are out there and could pop up any time!"
Meanwhile, the actor also said that some Home and Away fans are campaigning for his character Heath Braxton to reunite with Bianca Scott (Lisa Gormley).
"On Twitter, there's all these little hashtags and the main one is 'Heanca' - I swear to God, the fans have gone rife with it," Ewing explained.
"Every second tweet is about how they want them together. Although, I don't know, he hasn't really proven himself yet."
Home and Away airs weekdays at 6pm on Channel 5 in the UK and weekdays at 7pm on Network Seven in Australia.