Clan Kits is by Leopard. It's about semi-ancient clans [a little before Pinestar lived] and their kits who mysteriously appear in the clans.
Clan Kits: Stepping Stones- Stonkit is an outcast in Thunderclan, his foster mother hating him. The river calls to him in his dreams. Can he connect the lies between Riverclan and his own?
Clan Kits: Wind Paths- Breezekit felt abandoned when his mother died, but does he know his father's secret?