Explanation:

- Vishal said, "Her mother is my sister's father's wife."

- "My sister's father" refers to Vishal’s father.

- "My sister's father's wife" would be Vishal's mother.

- This means that the woman in the photo is Vishal's mother.

Options:

1. Wife: This would not be correct as the woman is linked to Vishal’s family as a mother.

2. Mother: This option fits, as the woman in the photo is Vishal’s mother.

3. Sister: This doesn’t fit, as the description leads to his mother.

4. Daughter: Incorrect, the description relates to an elder, not a younger generation.