Sibling issues

My two cats Tot and Tove dont feel safe around each other and they are having issues living under the same roof. Tot and Tove are both female and they come from the same mother at the same time. We are though pretty certain that they have different fathers as Tove is a fucking unit while Tot is an elegant beauty. This means that every time they even play Tove Wins significantly and since Tove is a moron she doesn't know when to stop. This has made them both nervous around each other as when Tove goes over the top Tot makes some very loud and angry sounds. Tove especially loves playing tag with her sister and does not understand why i stop her.

They have access to both inside and outside which is a large garden with a seemingly endless supply of mice

They each have around three safe spaces around the house where the other doesn't disturb them

I love them both very much and i really hope i can do something to make them feel better around each other