Although Colin’s Instagram is a testament to his activism for the Black community, he has remained close to his family throughout his NFL career. He has two older siblings, Kyle and Devon Kaepernick, from his adoptive family, and three younger siblings through his birth mother. Unfortunately, it appears as though Colin has never met his birth mother and, because he remains so dedicated to his adoptive family, there might not ever be a need for that on his part.
On VH1’s Dear Mama in 2018, Colin praised his adoptive mother and family despite feeling different from them from a young age.
“You have a family that you love, but you know you don’t look like,” he said at the time. “And at a young age… I understood that I was different, I didn’t understand what that meant.” He explained that he and his family worked through the struggle of understanding together. “We’ve always been very loving in the process and I wouldn’t do it with anybody else,” he added.
Source : https://www.distractify.com/p/colin-kaepernick-parents