I thought it'd be fun to discuss who we think are the parents of our favorite characters who didn't have their parentage confirmed in the books. Even if Vicky's mentioned parentage for someone (such as Willowpelt and Patchpelt being Graystripe's parents), feel free to post your own ideas.
Here are some of my ideas:
Deadfoot is Crowfeather's father.
Deadfoot seemed to take the other StarClan cats' questioning of his choice for the Sundrown journey quite personally, which I can't see him doing if Crowpaw was nothing more to him than a candidate for the journey. Deadfoot is also rather similar in color to Crowfeather, and their personalities have some similarities.
This theory is commonly argued against by saying Deadfoot died before Ashfoot was even pregnant with Crowfeather, and while I agree that it does appear that way in the novels, I think it's worth noting that one of the Ravenpaw manga books shows Deadfoot participating in a search patrol for none other than Crowkit.
If what's depicted in the manga is correct, it's entirely plausible that Deadfoot fathered Crowfeather.
Lionheart fathered Frostfur's kits.
I believe Vicky has said something to the effect of "according to my notes, Lionheart never fathered any kits", but still, I think this theory makes a lot of sense. Three of the four kits (Brightheart, Thornclaw, and Brackenfur) have similar coloring to Lionheart, and it could be said that they have a lot of his qualities as well.
Actually, scratch that; after reading a comment on Vicky's Facebook where, when asked who fathered Frostfur's kits, she replied with "Whitestorm would make sense, but don't quote me", I've changed my "vote".
WHITESTORM fathered Frostfur's kits.
Personally, I think Whitestorm DOES make sense as the father of Cinderpelt, Brightheart, Thornclaw, and Brackenfur. Actually, all things considered, I think he makes more sense than Lionheart. Unless I'm forgetting something, with Lionheart fathering Frostfur's litter, Cinderpelt was left pretty much an oddball, whereas with Whitestorm as the father all four kits' colorings are explained.
Brightheart, Thornclaw, and Brackenfur's golden/ginger fur could have come from Whitestorm's paternal grandmother, Poppydawn; she was described as "dark red", which is basically a darker version of their golden/ginger. And Cinderpelt's gray could have come from Whitestorm's mother's family; his grandparents on that side were both gray, as was his aunt.