On Friday March 27th, five-year-old Seth Lane will undergo a bone marrow transplant - his second one in four and a half years. To show support and raise awareness of the Severe Combined Immunodeficiency (SCID) disease the young boy suffers from, his family has one simple request. They want everyone to wear Seth's favorite color yellow, and post pictures on Facebook, Twitter or Instagram, with the hashtag #WearYellowForSeth.