Ok so, Bluestar's mate is Oakheart, and his brother is Crookedstar. Crookedstar's daughter is Silverstream. Her mate is Graystripe. That's how those 2 are related! So back to Bluestar. Her sister is Snowfur. Snowfur's mate is Thisleclaw, and their son is Whitestorm. His mate is Willowpelt, and her brother is Redtail. Redtail's mate is unknown. They had Sandstorm. Sandstom's mate is Firestar.
So that's how!