So this morning before school/nursery my son(5) and daughter(4) were going down the stairs. My youngest brother (13) came up the stairs and blocked their way telling them to move aside . They started trying to get past him and my daughter fell down the stairs but wasn't hurt just upset. I saw a bit of what happend but not everything now my brother is blaming my son saying he pushed her and the kids blaming him saying he blocked their way.
Now this might not seem all that sirieus but my mom came in blaming my kids for going upstairs wearing shoes and that it's dangerous (we normally don't wear shoes inside). I'm annoyed and told all of them off but apparently I shouldn't tell my brother off and I'm being biased. AIBU or is my mom? Oh and my mom and brother don't live with me but stay over a lot.
(Sorry english is not my first language )