How do I talk to my daughter about her gay aunts?

I have a 7 month baby and a sister who is gay and married already with a woman. She send me until now gifts for the girl like clothes and some toys and she is very happy that she has a niece. The question is how do i treat this subject from now on wit my child.Now she is small but in a year or so she will start to understand who is family and who is not. Will it be aunty Andrea and aunty Julia and how do i explain this to my child?

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