Diego | 'Hound''s Links
Diego looks up to Santiego- secretly. While he hates him for teasing all the time, and being your stereotypical big brother, he loves him really. They are very close, and Santiego is a rock to Diego as he deals with pretty major mental health issues.
Santiego loves his little brother Hound- his favourite thing to do is tease him, but he is always there for him and will not let anyone mess with his family. They have a close bond, though they don't see each other *too* much due to deployment.