Blood-relation questions test whether you can decode family links from a description and name a target relationship. CA sets them as plain statements, coded relations (symbols standing for links), or self-referential "photograph" clues.

How it works

Every statement describes one edge of a family tree — a couple, or a parent-to-child link. Translating each phrase into an edge and stacking the edges by generation turns a confusing sentence into a picture you can simply read.

Coded forms replace words with symbols (e.g. $A+B$ = "$A$ is father of $B$", $A\times B$ = "$A$ is brother of $B$"). Convert one symbol at a time into a tree edge before combining. Photograph clues are self-referential: unpack them from the innermost phrase outward.

Building the tree

1. Draw generations top to bottom (elders on top).
2. Convert each clue into one edge and place it.
3. Tag gender wherever the clue states it.
4. Trace from the last-named person toward the subject, exactly as the question asks.

Quick example

Pointing to a photograph, a man says, "She is the daughter of my grandfather's only son." How is she related to him? …