The most beautiful woman

My son and his cousin were having a conversation on what they dis/like about their mothers. My niece says 'the thing I like about my mum is, she makes me laugh, she's a good cook etc, and she's the most beautiful woman in the world'.

My son jumps in and, 'second'.

We looked at each other, 'what'.

My mum is the most beautiful woman, yours is the second.

What more can I say?