My daughter is being treated differently what should I do?

My two year old daughter is being treated differently by her grandparents (my parents). They are harder on her. When she cries... my dad say things like, "what are you crying for... wait to you get older." "No one wants to deal with that and wants to be around that." My mom told me that my 7 month daughter is going to be more positive and loving than my two year old. My dad calls my 7 month"His baby" but doesn't say that to my two year old. They even treat my niece (4 years old) better... my niece get away with everything but if my child does something she gets in trouble. Sometimes my daughter doesn't like to come around my parents and she starts to cry or she just stays quiet. When she's around me and her dad she is her self. She talkative.. laughs... and being silly... I always been the black sheep... and I don't want my daughter to go through things I been through. I can't wait to move far away.

My daughter is being treated differently what should I do?
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