Who is Firestar's mate?

Firestar's kin are:

His sister, Princess

His nephew, Cloudtail

His two daughters, Squirrelflight and Leafpool

His five grandchildren, Hollyleaf, Lionblaze, Jayfeather,

His nephew's daughter, Whitewing

His nephew's daughter's two kits, Dovepaw and Ivypaw

His half brother Scrooge