Board Thread:General Discussion/@comment-121.7.195.67-20161128145037/@comment-26332460-20161208054628

Regarding Hizamaru and Higekiri - it's interesting to note that even though they were smithed by different people, they came from the same source (depending on the tale, it differs from a lance or steel). This is why they are brothers (twins, even) in the literal sense despite having different smiths.

Taroutachi and Jiroutachi also have different smiths - they were even made in different eras, and Jiroutachi is actually older because he was smithed first. Yet they consider each other brothers and address each other as such.

I think if swords can have different smiths and consider each other brothers, then swords from the same school (in this case, Sanjou) do not nessecarily have to be brothers or even related in a family way.

To answer your question directly... no, they do not from the sounds of it. More like they see each other in a respectful way, almost as if they were part of the same company haha. It'll be interesting to see if they develop the swords further though.