Is there a third Winchester brother in The CW's Supernatural??

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Dec 14, 2012, 3:54 PM EST

E! Online's Watch With Kristin column reports that the Winchester brothers on The CW's Supernatural will get a third member. (Spoilers ahead!)

Jake Abel (Threshold) has been cast as the third sibling of Sam (Jared Padalecki) and Dean (Jensen Ackles): 18-year-old Adam Milligan, who will make his first appearance in the show's April 23 episode, E! reported.

Citing anonymous sources, the column reports that Jake will appear in only one episode and is not expected to be seen again.

As first reported by TV Guide, Adam is the result of an affair that Sam and Dean's father, John (Jeffrey Dean Morgan), had while on one of his demon hunts. He knew about the boy's existence but never told Sam and Dean.

Supernatural airs Thursdays at 9 p.m. ET/PT.