Email your dad NOW.
You and your sister & mom shouldn't be paying the price for your step-father's mistakes. Find a friend to take your birds and any other animals for the summer (at least) and go for a L-O-N-G visit with your dad.
Until he can get there to pick y'all up, find a time when...
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my full mom married my step dad. my step grandmother is my step dads mother yes. my sister is only treated this way when she does something she isint supposed to do. and very very rarely any other time.
my mom knows about this. she tries to sit down and reason with step grandmother but...
What does your mom say about all this? You are living with your step-grandmother--how exactly is she related? Your mom's step-mother? Or your step-father's mother? Is your sister treated the same way as you are? And is she also a step-grandchild, or a full one? Where is your step-father...
Can you give us some examples? Sometimes people don't realize how their tone or words sound to others--and that could be her...or you...or both. Or it could be something else entirely.