It’s been hell

My oldest came back on Sunday and since then June baby has been loosing her shit! Like if he sister goes to the bathroom she freaks out. Her sister went outside and she had a mental breakdown. How is she going to handle her going to school? And why won’t court take how this effects a 2 year old with the custody of another child! Also trying not to lose my cool with my oldest. I’m trying to stick to routines and not letting her throw these fits or meltdowns. But my teen just is babying her or getting in the way of routines. Like tonight she needed to get ready for bed but didn’t want to leave her sister and instead of her sister coming to help she held her and said it’s fine. Like the hell it is she needs to get ready for bed so I just grabbed her and had 2 kids throwing a fit. I didn’t let June baby leave her room till after she decided to calm down.