Do parents have favorites?

I notice this in my example my mom helps out my older half sister now (36) a lot when my sister went threw a divorce my mom offered to help took care of my sister's kids and help out until my sister was able to make it on her own. My mom had her very young 16 at that time. I notice that with me the treatment has always been different my mom would say rude comments oh well no one told you to do that , Oh that's your own fault. Right now I am going threw really hard times some how I managed on my own. My mom know what has been going on not a single phone call or even care , I also have a younger sister same thing my mom spoilers her with me it's like I am the scapegoat. Parents have the favorites kids?
Do parents have favorites?
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