Thread:Gilgameshkun/@comment-5339385-20151203230518/@comment-995426-20151214155359

I didn't say I know absolutely everything about Mirage Comics. However, nothing canonical comes to mind that says either way that the turtles are biological brothers or not. The semi-canonical The River (part of the Guest Era) claims they were born together in a bucket of water in the back of a Woolworth's store. (Of course, this was either a wild guess by one of the characters, or knowing this as fact raises more unanswered questions.) The canonical Sons of the Silent Age references The River in explaining why Raphael still feels traumatized, but otherwise doesn't revisit the events of that story. Peter Laird's later decree of canonicity makes The River itself apocryphal, if not entirely non-canon.