#screaming

I am having a hard time communicating with my 6yo son. Help!

I am having a very hard time with my 6yo son. As soon as he sees me he looks disappointed, gets angry with me, talks to me in a bad manner, starts acting up, and doing things that he knows he is not supposed to do. His brother tells me that he doesn’t do that with dad and at his house he does what he is told. I have had a lot of stress at work and with personal matters so I struggle sometimes to stay in the moment and be as fun as dad is. I try to talk to him and have patience but it gets to a point where I explode because he is just not listening to me and keeps escalating the situation. I tell him to stop several times, his brother does too and he keeps going.
Please remind me when he talks to me in a mad manner or screams at me what is the best way to handle.

My older son screams at his 2yo sister and she screams right back. How can I break this cycle?

The sibling relationship in my home between my son and my daughter (2yo) has become unbearable. My son doesn’t want his sister near him but when she is playing or doing something else he goes and bothers her, screams at her - so naturally she “fights back” and screams at the top of her lungs. Help! I don’t know how to break this cycle…