"Quot sorores habes?"

Translation: How many sisters do you have?

[Heithr]

Nemo, sed frater mea una habet.

[Doubledealer]

I'm curious if this is correct. I'm still learning latin but I understand you're trying to say "None, but my brother has one"? If your brother has a sister then surely she's also your sister?

Since frater is masculine wouldn't it be 'frater meus'?

[heartfull.]

It got counted as wrong because i didnt put the question mark.