Do any of the founders still have living kin in shadows reignited? Probably veeeery distantly related atp but I THINK you said graystripe was a descendant of thunderstar, so stormfur and his kits count too right?
Yes quite a bit actually!
Thunderstar -> Feather ear -> (missing generations) -> Stoneflower & Tinyclaw -> (missing generations) -> Leafstorm -> Redstar & Amberclaw -> Dawnfeather -> Nettlebreeze & Mapleshade
Petalshade and all of her descendants are from Thunderstar's lineage! this goes all the way to Frostdawn as a matter of fact.
Riverstar -> Dusk smoke & Ripple Shine & Arc Shadow -> Aspentail -> Fallowtail & Cedarpelt & Marshcloud
a LOT of modern RC characters have Riverstar's blood. Willowbreeze & Graypool, Silverstream, Feathertail & Stormfur, Sunfish, Frogleap, Sneezecloud, Splashtail. basically anyone descended from Fallowtail or Marshcloud! :P
Shadowstar had no biological kits. However, the erins said they liked the idea of Blackstar being related to Spider Paw. (bear with me here)
Shadowstar and Sun Shadow have a bit of a non-nuclear family situation with Bubbling Stream. They act as mentors and trusted adult figures to her, so Shadowstar does consider Bubbling stream her legacy. Bubbling Stream is the ancestor of Blackstar, who got his polydactyl paw from his mother Hollyflower. (his littermates Flintfang and Fernshade have it as well!)
so Hollyflower, Blackstar, Flintfang, Fernshade, and Badgerfang are Shadowstar's lineage, though not by blood.
Windstar actually has canonical descendants! being Crowstar & Gale Rise, plus Mistmouse and all her descendants. Here's how it is in WCSR:
Windstar -> Moth flight -> Blue Whisker -> (missing generations) -> Squirrelbrush & her littermate -> Ripplegrass & Duststar -> Crowstar & Gale Rise -> (missing generations) -> Mistmouse
Mistmouse would be descended from Crowstar, whose son was Ryewhisker from Code of the Clans. A LOT of important WindClan characters in WCSR have Windstar's blood
Crowfeather, Mudclaw, Gorsepaw, and Breezepelt, for starters. But also Hollyleaf, Jayfeather, and Lionblaze! and Lionblaze's three kits, Spotfur Flywhisker and Snaptooth. plus Spotfur's kits. so Windstar's blood is alive and well in both WindClan and ThunderClan.
so obviously Skystar is the father of Thunderstar, but I won't repeat Thunderstar's lineage.
his lineage is as follows:
Clear Sky -> Dew Petal -> (missing generations) -> Cloudstar -> Spottedpelt & Gorseclaw -> Thrushtalon -> Mumblefoot -> Adderfang
so Tigerstar, Spottedleaf, Redtail, Longtail, Swiftpaw, Graystripe, Sorreltail, Hawkfrost, Mothwing, Tawnypelt & Brambleclaw, Tigerstar II are all clear sky spawn. and all their descendants. thats SO MANY CATS.
fun fact: Birchfeather means Skystar's blood has returned to SkyClan for the first time in 32 years! (cloudstar died in year 80, and Birchfeather joined SkyClan in yr 112)
and Er... I did accidentally do a whoopsie and make Graystripe and Silverstream related. but their most recent ancestor is CLEAR SKY, which is probably around 80 generations back. so... I don't think it counts. (if they were humans, that's like sharing an ancestor in ancient Rome)