Yes, they are.
Crowfeather is Jayfeather, Lionblaze and Hollyleaf's father.
'real brothers': Jayfeather and Lionblaze. Half brother: Breezepelt (rogue, originally from WindClan)
Leafpool is the mother of Hollyleaf, Lionblaze and Jayfeather.
No, Hollyleaf is not one of the three. Jayfeather and Lionblaze are though.
No. Lionblaze and Jayfeather are a part of the three, but Ivykit isn't. Dovekit is the third cat of prophecy.
Leafpool's kits are Jayfeather, Hollyleaf, and Lionblaze. They are born to her and Crowfeather, but are raised as Squirrelflight's kits to keep their true parentage a secret. Each kit plays a significant role in the later story arcs of the Warriors series.
yes
Crowfeather
Hated them
Who knows? The true answer is hiding in a book. But right now, Hollypaw (hollyleaf) has not been found by her brothers, Jayfeather and Lionblaze
Well there certainly is a pattern to the warrior books. Firestar killed his half brother Scourge and Brambleclaw killed his half brother Hawkfrost so Jayfeather or Lionblaze will kill Breezepelt. I would think mabe even Leafpool will kill Breezepelt trying to save Jayfeather or Lionblaze because she loves them and mabe Breezepelt set up an ambush or trap. Moonshadow & Icecloud:)
yes