Older sister: 'Little brother, little brother, you're amazing, even better than Dad!!'
Little brother: 'That's right, Mom says the same thing.'
Older sister: 'I and Dad gave birth to you, so I am Mom!!'
Little brother: 'No, then who is the person we call Mom?'
Older sister: 'She is Dad's Mom!'
Little brother: 'Isn't she Dad's sister?'
Older sister: 'She is Dad's sister, and also Dad's Mom, just like the relationship between the two of us!'
Little brother: 'So the person we call Mom is also our aunt?'
Older sister: 'Yes, you are so smart.'
Little brother: 'So the person we call Mom is also our grandmother?'
Older sister: 'Yes, you are very smart.'
Little brother: 'So the person we call Mom is also my maternal grandmother?'
Older sister: 'Yes, that's correct.'
Little brother: 'Then is our Dad also my maternal grandfather?'
Older sister: 'Yes, that's right.'
Little brother: 'Then sister, what about your maternal grandparents?'
Older sister: 'My maternal grandparents are Dad's grandmother and Dad's grandfather.'
Little brother: 'Oh, so complicated.'
Older sister: 'It's not complicated; it will only get complicated after my child is born.'
Little brother: 'Oh? Why would it be complicated?'
Older sister: 'Because I don't know whether the child I'm carrying is Dad's or yours.'
Little brother: 'So that means your child could be my little brother or sister, or could be my son or daughter?'
Older sister: 'Yes.'
Little brother: 'Then what's so complicated about that?'
Older sister: 'The key is, when my child grows up, will they call you Dad? Or Brother? Or Uncle?'
Little brother: '… hehe'
