Can a aunt be your mom?

Yes. Plenty of people have been raised by an aunt when their own mother either wasn't around or was otherwise unable or unwilling to raise them. In that sense, your aunt becomes your mom.

No, your mom is your mom, your aunt is your aunt. Your mom is the person who gives birth to you, you come out of her. I shouldn't need to explain what a mom is, you should know. :P

Sure my grandmother served as my mother. Mom is weird.

yes

If she asopted you