Sounds like a misleading post seen on bubblews.com that Dawn and Bamboo are siblings.
They may have little similarities but definitely they’re not siblings. Dawn Zulueta in real name, Marie Rachel Salman-Taleon-Lagdameo was born in Luzon. Her parents are Mrs. Maria Cleofe Salman-Taleon and Mr. Jose Fazil Taleon. On the contrary, Bamboo in real name, Francisco Gaudencio Lope Belardo Mañalac, is from a well-known and influential family in Mindanao.