Our aunty.
cousin
Mom
In Hindi, you would call your mother's sister "mausi" or "masi".
Our cousins are our mothers sisters son :)
His relationship to you is brother-in-law.
Mothers sister is aunt and son is cousin so daughter wouldn't that be a niece
Your mothers sister is your Aunt
A gatecrasher.
In Arabic, you would refer to your mother's sister as "خالة" (khala).
You could call them as a brother/sister or as a cousin... If you're asking for yourself then good luck with that family.
Her sister was named Aga.
The child of your mother's sister is your first cousin.