If the only sister of your mother's only brother, had only child. What is that child to you?

Question

At your wedding, you are introduced to your new partner’s mother’s only sister’s husband’s sister in law.

What do you call this woman?

Answer 1

I AM that child,
Or
That child will be my brother/sister

Answer 2

That child would be me, because the only sister is my mom, and if she had an only child, and if she was my mom, that child would logically be me.

Answer 3

I will be the child as my mom is the only sister of her brother and child to that only sister is me.

Answer 4

That's 'You'. It's self.