Ugh I'm so tired of my brother talking to my kids like he's their parent. Then he argues with me…

Ugh I'm so tired of my brother talking to my kids like he's their parent. Then he argues with me about how to raise them. Like wtf?! You know nothing about kids so shut your mouth! He yells at my almost 10 month old like he's in trouble cause he's crawling around and almost getting hurt cause my brother isn't looking out for little hands and feet.