No, because they are half brothers!
No, Firestar has no way of knowing that he is related to Scourge.
Jake, who was also the father of Firestar, but they had different mothers.
Scrouge's parents are not clarified, but in the manga it says that they are both kittypets.
Firestar
They might be since Firestar's daughter, Squirrelflight, is Brambleclaw's mate.
He offered Firestar to sleep in his backyard for one night.
No . Firestar's kits are Leafkit/paw/pool, and Squirrelkit/paw/flight. Graystripe is Firestar's best friend and Silverstream was his mate.
this is an opinion to me it would be Firestar
No, Firestar isn't related to Graypool.
Yes, Firestar is in love with Sandstorm.
After Firestar dies? They will be atleast another three.
No, because Firestar is Squirrelpaw's father.