random rant!!!!! Need your help

okay so i have a 3 year old about to be 4 . my lil cuzin who is 7 years old when he use to come to my house. Before this whole corona virus going on. he would always fight with my boy and be mean but always to cry and tell him mom which is my aunt that my son is being mean . And of course she always takes her son side and says my son is being mean . when we go to her house the 7 year old won’t let me son touch he’s toy he’ll start crying and grow himself on floor and be plain rude saying he only likes my youngest boy 2 years old and doesn’t my son the almost 4 year i’m few months . And i get pissed off and tell my aunt that her son is being mean and doesn’t share . she’ll make excuses and b like he’s not used to sharing he’s toys and blah blah . But mind you i have 5 years living alone with no family around . and my aunt has lived years around family. but she says her son is small to understand him and if he doesn’t wanna share she’ll find a another toy for my son. but when they come over here she’ll make a big deal saying you need to becareful if not your son is going to be a trouble maker and have a hard time in school for not sharing ... like wtf does she not see how her son is. if my kids do anything wrong i tell them right away. i always as fair as i can be . no matter what.... sorry for the long rant..... but i’m just pissed cuz my aunt since this happen is telling me her son misses my kids. but then he’s around my boy and is mean and she doesn’t say anything to her son. i’m pregnant and tired 😓...... hope this make sense