Is she in the bedroom ?
yes, she is
Is he in the bathroom ?
No, he isn't
Is brother in the garden ?
Yes, he is
Are they in the garden ?
No, they aren't.
Are they in the garden ?
No, they aren't
Are mum and brother in the bedroom ?
Yes, they are
Is mum in the garden ?
No, she isn't
Are sisters in the kitchen ?
Yes, they are