No, he doesn't.
No, as far as we know Longtail did not have a mate, and Mousefur never had kits.
no yes he ambushed him mousefur and thornpaw and killed runningwind.
Runningwind was killed by a pack of dogs during a battle in the book series Warriors by Erin Hunter.
No, he doesn't have any kits.
Tigerstar killed Runningwind as part of a plan to weaken ThunderClan and provoke conflict between the clans. He wanted to assert his dominance and show his power as a threat to those who opposed him. Runningwind's death was a deliberate act of violence to further Tigerstar's own ambitions and control over the forest.
No, he was an innocent warrior.
yes they are brother and sister
Dovewing and Foxleap do not have kits together, nor become mates.
yes. He is killed by Tigerclaw and his band of rouges.
No
No, Spottedleaf did not have any kits in the Warriors series.
Well that depends on where your reading because lots of kits are born.