sandstorm is his half sister.AND yes
No, Ashfur does not know that Sandstorm is his half-sister. Their parent, Brindleface, is Ashfur's mother and Sandstorm's stepmother, so they are related through their mother. Their connection is not explicitly addressed in the series.
Redtail's mate is Brindleface. They have kits together, including Sandstorm and Ashfur.
Yes, Squirrelflight is related to Ashfur through blood ties, as she is the daughter of Firestar and Sandstorm, while Ashfur is the son of Brindleface. In this familial relationship, Squirrelflight would be Ashfur's cousin, not his niece.
Not by blood, no. She is related to him in that Dustpelt mentored her as an apprentice. They are also distantly related in the following line: Sandstorm's mother is Brindleface, and Brindleface's brother is Dustpelt.
No, Sandstorm's mother was Brindleface. Brindleface was a queen in ThunderClan and the mother of Sandstorm and Ashfur, among others.
Redtail's mate in the Warriors series was Brindleface. They had two kits together, Sandstorm and Ashfur.
Several cats died in "Long Shadows," including Longtail, Smokefoot, and Firestar's mate Sandstorm.
Erin hunter said brindleface is sandstorm's mother, making her half sister ferncloud.
Sandstorms usually involve lots of sand and dust flying everywhere and the air looks a different colour but I don't know what makes a sandstorm a sandstorm!
Ashfur's mentor was Dustpelt.
Hollyleaf yep,hollyleaf.many say squirrelflight,but there wrong![i read the books i know the truth]
Hollyleaf did. As you know she's practically obsessesed with the Warrior Code and couldn't let Ashfur tell anyone that she wasn't Squirrelflight's kit.
No, they would have been mates (probility) and firestar may have been mates with spottedleaf instead of sandstorm. if it werent for firestars loylalty sandstorm would have been dustpelts mate.