Blood Relations
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How to solve blood-relation questions
Mirror pairs
\text{father} \leftrightarrow \text{son},\ \text{uncle} \leftrightarrow \text{nephew}
Every relation has a mirror. If A is B's uncle, B is A's nephew or niece.
Marriage words
\text{child's spouse} \to \text{son/daughter-in-law}
Spouse's parent = father/mother-in-law. Sibling's spouse or spouse's sibling = brother/sister-in-law.
Cousin
\text{cousin} = \text{child of a parent's sibling}
An uncle's or aunt's child is always a cousin, never a nephew.