Sometime after 10 new keys (read 10 new keys to get some idea of Jayfeather's (or Jaypaw during it) antics outside of the forest. It's a wonder everyone survived, well most of them anyway with hints like spoilers of the end of 10 new keys. Please note this part takes place around the same time as the end of Sunrise, without the secret being blown do to differences in my canon. All of what is mentioned is canonically correct as stated by the warrior's books; mainly super editions and Erin Hunter herself. Also some info was gained from the official warriors website family tree
" Ah Jayfeather, congratulations on the full medicine cat name" Thomas said as he warped in on Jayfeather who was gathering catmint at the abandoned Twoleg nest. " Thomas, what do you want" Jayfeather asked curious. " Jayfeather, as you know, I had to keep you in the dark on some secrets of Sora and Kairi so I think telling you some interesting secrets. " Secrets?" Jayfeather asked. " First, did you know that the blood of two different clans flows in Thunderclan today, and I don't mean Mistyfoot or Tawnypelt's kits. First Sorreltail father was a cat named Whitestorm who you probably have met in Starclan who was fathered by a cat named Thrisleclaw. Now Thrisleclaw was fathered by a cat named Windflight who had both Windclan and Thunderclan blood so you see Sorreltail, Honeyfern, Poppyfrost, Graystripe, Stormfur, Feathertail, Graystripe's newest kits, Whitestorm and Cinderheart have Windclan blood." " Okay, interesting, should I mention it?" " To them privately, yes, to Windclan no, and anyway also you know Skywatcher correct?" " Well, he was one of the cats who granted me the keyblade" Jayfeather said interest growing. " Well he belonged to the lost clan, Skyclan who Firestar and Sandstorm rebuilt during which he heard the prophecy that concerns you. Well when they left, two kits were given to Thunderclan to care for because they were too young. These cats are the ancestors of Spottedleaf; Willowpelt the mother of Sorreltail so thus applies to her relatives who I mentioned earlier and Redtail, Bluestar's first deputy who was Sandstorms father and thus to you as well it also applies to Tigerstar and his family so you got Skyclan blood Jayfeather." " Wow, all of this information, it is giving me a headache" Jayfeather laughed. " Also as you may have guessed some time ago, you are related to Scourge because he is Firestar's half brother". " Whoa, that is just disturbing" Jayfeather shivered. " Yes it is weird, and finally I will leave you an ominous warning as is proper for a medicine cat A child of Birchfall and Whitewing who shares her name with a Twoleg symbol of peace is the third, and while you get the third, the forest will lose three great cats, the face of a tree, the star of spots and the hero of the legend that blazes!!!!!!!!!" Thomas said before disappearing. " Ohh..kay, that was weird. But did he mean that Barkface, Leopardstar and Firstar are to die soon??"