The kits are born between series. The last chapter of Firestars quest has it. It doesn't talk about their birth, but it's the first time leafkit and squirrelkit appear
Sandstorm has her kits in the prologue of the book "The Darkest Hour," when she gives birth to Firestar's kits in ThunderClan camp.
They don't in The Darkest Hour
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Yes they are mates. In the darkest hour FIrestar admits to himself that he loves Sandstorm. And she loves him as well! They have two kits in FIrestar's quest named leafkit and squirrelkit and leaf paw, who become leafpool and squirrelflight!
Firestar's mate in Warriors is Sandstorm. She is a flame-colored tabby she-cat with green eyes, known for her independence and loyalty. Sandstorm and Firestar have kits together named Squirrelflight and Leafpool.
Willowpelt's kits in "The Darkest Hour" were Graystripe's kits: Sootfur, Rainwhisker, and Sorreltail. They were born before Graystripe left ThunderClan to be with RiverClan.
Sandstorm's kits are Squirrelkit (Squirrelflight), and Leafkit (Leafpool).
Firestar and Sandstorm had their kits sometime between the end of the first series and Firestar's Quest.
She has her two kits, Squirrelkit and Leafkit, in Firestar's Quest. It is soon after she and Firestar return to Thunderclan that she gives birth.
No, she has kits with fireheart.
Well, of course it never happens in detail XD. But, since Sandstorm has kits at the end of Firestar's Quest, we can only assume it happened sometime between The Darkest Hour, and Firestar's Quest.
Sandstorm had her kits in the book "Twilight" in the Warrior Cats series.
Yes. Firestar started noticing Sandstorm around Rising Storm. An experience that made them connect was when Firestar saved Sandstorm from falling over the gorge. (when Firestar was Fireheart and Sandstorm was Sandpaw). After that, they couldn't stop looking at each other! In The Darkest Hour, they both admit that they love each other and Sandstorm goes to sleep with Firestar in his den when the battle with BloodClan was going on. After that, in the end of Firestar's quest, they have 2 kits named Squirrelkit (later Squirrelflight) and Leafkit (later Leafpool, med cat).
No one has sandstorm and Firestar are still alive and they have grand kits
Well Firestar admits to himself that he loves her and she loves him. So it is generally admitting things that they became mates.