my dad and i were arguing, all because i went into his car and got my knife out of it, he had lost his prior and was holding mine as "ransom" (hes a fucking lunatick) until his was found, he than got in my face, hoping i would back down and i didnt pushed him back and thats when he went to my garage, i didnt see him do it but i heard an impact, when i came home an hour later me storage cabinets were spraypainted, and noticed the dent and spit. its his house so i know he wouldnt do the spraypaint, pritty much its him and my sister who are involved. what should i do?