Yes, Emily Cyrus (Emily Yvette Cyrus) is related to super star sensation Miley Cyrus (Destiny Rae Cyrus), Emily disappearing away from the media and the tabloids back in 2009. Emily Cyrus is 16 years old now (2012)
Emily Cyrus is a young cousin of former actress and singer Miley Cyrus. Who she can actually can communicate with fans or friends Emily Yvette Cyrus's Facebook adress is EmilyyCyruss@yahoo.com her twitter is @EmilyLoveCyrus.
Miley Cyrus did date him but they broke up and then Emily osment was with him and then Miley Cyrus and Emily osment stoped being friends for a while until Emily osment stoped dating him and now she is not with him and Emily osment and Miley Cyrus are friends again
Emily Grace is not Noah Cyrus' sister, they don't have the same parents. Emily Grace is said to be the daughter of one of the Cyrus' close family friends and it has also said that she is a cousin. I'm not sure which one it is though.