L is the mother of E. E is the sister of M. O is the father of N. N is the son…

Concept

In a blood-relation chain, move one link at a time and track both generation and side of the family. A parent is one generation above; a parent's parent is two generations above.

When a person is the child of a mother, that mother's mother is the person's maternal grandmother.

Application

1. E is the sister of M, so E and M are siblings. L is E's mother; in this family chain, L is therefore also M's mother.

2. N is M's son, and O is named as N's father; hence M is N's mother.

3. Following N → mother M → mother L places L two generations above N through N's mother.

Cross-check and contrast

The generation count confirms that L is not N's mother, mother's sister, or sister. L is N's mother's mother, that is, N's maternal grandmother.

• Mother: one generation above N.

• Mother's mother: two generations above N through N's mother.

• Mother's sister: in N's mother's generation, not the grandparent generation.

• Sister: in N's own generation.

Therefore, L is related to N as his mother's mother (maternal grandmother).