No one knows for sure when Cinderheart will die. Cinderpelt died in a badger attack at the end of Twilight and came back as Cinderheart, but no one knows when Cinderheart will die.
Cinderheart's father is Brackenfur.
Cinderheart's mate is Lionblaze. They have kits together named Hollytuft, Sorrelstripe, and Fernsong.
No, Cinderheart and Cinderpelt are different cats in the Warriors series by Erin Hunter. Cinderpelt is the medicine cat of ThunderClan, while Cinderheart is a warrior. However, Cinderheart carries the spirit and memories of Cinderpelt due to a unique occurrence in the series.
There have been lots of rumors that Cinderheart and Poppyfrost both like Jayfeather.
Cinderpelt was reincarnated as Cinderheart, though she doesn't even know it.
Spiderleg and Cinderheart were Cloudtail's apprentices.
In the Omen of the Stars series, Lionblaze realizes that he feels affection toward Cinderheart.
It is unknown if Cinderheart likes Lionblaze, but in Fading Echoes it is hinted that Lionblaze feels affection toward Cinderheart.
When she is awake, she doesn't. But, sometimes in dreams, she remembers the old ThunderClan camp and life when she was Cinderpelt, a Medicine Cat.
Cinderheart was the Deputy of ShadowClan, so yes. Yet; he passed away from sickness along with most of ShadowClan.
I wish!
No, I don't think so, because Lionblaze likes Cinderheart in the book Night Whisperes.