Kanta's parents hated the Halsteads. Kalpana considered the Halsteads to be valor stealing bastards trying to turn the Brotherhood into a fraternity, prioritizing dick-measuring over the hunt. Asim saw the Halstead's overbearing sense of pride as an ultimate fatal flaw that will get everyone killed if not extinguished. Though their parents' opinion blemished young Kanta's first impressions and interactions with Reid, they were eventually proven wrong and warmed up to him.
Shiv can recall so many embarrassing stories from their training days, specifically ones where Reid's cockiness came back to bite him in the ass. Are these stories more exaggerated than what actually happened? Maybe. Just a wee bit.
Shiv did not know what happened to Reid until returning home and reviewing their father's casefiles, was completely shocked upon discovery. When you look up to someone for so long, you sometimes forget that he's not actually invincible. Out of the two of them, Shiv would have bet that the hunt would have taken them first. It'd be funny if it were anyone but Reid.