Childhood conflict

I remember taking the blame for a lot things when i was younger for things my little brother did. No matter what happened if my little brother said i did he was right. This led to many conflicts between me and my step-mom. My dad on the other was a little more resonible and tried to listen to both sides. I remember this one time i walked out of my room and my little brother, Gio, threw a lightsaber at me and missed. It went pass me and hit one of my mom's collectible things and broke. My brother ran to my mom and told her that I stole his lightsaber and hit the collectible thing and broke it. So my mom calls me over and start yelling at me for no reason. I try telling her that Gio threw it at me and i moved out of the way and then she started saying i should have just let it hit me so nothing broke. I said that her logic was dumb and started to walk away. Then she got even more mad and started yelling at me for giving her attitude, but i just gave up this pointless argument and went to my room. I was used to this so it didn't really affect me to much, it just made me a little angry.
I think the real reason she was yelling at me and putting all the blame on me was that she just needed someone to blame and she wasn't going to blame her precious little baby so i was always first on the chopping block. This was usually the main reason we ever fought, only when something was broken or not done correctly was when i was getting yelled at. Unfortunatley for me there was usually something broken or not done correctly on a day to day basis.