Son compartido

This is gonna sound bad. Bit of context I am 18 and have a 16 year old sister, a 14 year old sister and a 7 year old sister. Us three older kids have the same dad whilst my youngest sister is my stepdads. My sister is 14 and has autism, adhd and mild anger issues. She’s more controlled now but when she was younger she would lash out easily and physically harm and threaten with weapons to people such as my other siblings, me and my mum. She’s also a kleptomaniac. She steals everything like my b