It's so sad to see the sweet relationship between Emily and her father, knowing that he's dead: BUT, in a show like Revenge... you never know who is actually dead. And Emily's father, David Clarke, didn't die on screen, so there's a strong possibility he's still alive.
“I’ve said it once before and I’ll say it again: If it’s not impossible, we’ll probably do it,” Kelley teased. “I love that character (played by Men in Trees‘ James Tupper)… but I can disappoint and titillate you all by saying you will not find out this season.” Regardless of what the future holds for David Clarke, Revenge does have plans to someday unveil what happened to Emily’s mother.
Cross your fingers that little Emily is one day reunited with her family!
Source: TV Line