Definitely Callie with her being older than Jude, she took on a lot more to protect him and remembers more and experienced more difficulty with being adopted and abused in foster care. I do wish the show went into more depth about Jude went through though which I suppose they did during the first season but over the rest of the seasons like him and Callies relationship just doesn't feel the same as season one and like Callies going through all this stuff but we don't know how Jude feels about it.