C is part of the Algol family. Fortran was/is syntactically and semantically quite different. Algol was almost contemporaneous with Fortran and, although did learn from Fortran, was, at least partly, a reaction to its perceived flaws.
Well, contemporary Fortran is probably part of Algol family too, since newer versions of Fortran (at least 77 onwards) incorporate the block structured programming concepts from Algol.
The "family tree" analogy works imperfectly for programming languages since it is more of a directed cyclic graph than a tree structure – Fortran influenced Algol and then Algol in turn influenced Fortran.
