Are you kidding me?
Are you kidding me?
______
No. Assuming these girls were 12 or 13 it could be a boyfriend.
If they were smaller, it could be a boyfriend taking revenge by going after little sisters.
It could be a teacher’s boyfriend.
I was thinking of the recent crossbow murders - of the killer’s ex-girlfriend, her mother and sister. The killer’s brother killed a man a few years back. They both have English names but features that look mixed European/Pakistani.