Rain and my car slides

Date: 9/1/2019

I was in my family home and sitting in the main living room and the sky starts raining very heavy rain. My Mercedes car was parking in the road in front of the house. Because of the rain another BMW740 crushed into my car from the back bumper and my car start move towards the main street and crushed another car. I was shouting to my mother and father why they did not engage the parking brake! I go to the main street and speak to Nawzad our neighbor and told him if he knew the person with lexus let him know that my car was accidently crushed in his car