Singer Billie Eilish and her brother Finneas are mourning the death of their family dog Pepper. It’s a sad day for Billie Eilish, whose beloved dog Pepper has died. The singer, whose full name is Billie Eilish Pirate Baird O’Connell, did not say how Pepper died but received condolences from fellow celebrities, including Demi Lovato, Nina Dobrev, Katy Perry and …