My mother in-law was in charge of babysitting my neice and also asked in my daughter could come spend time with them. While she was watching both children she wasn't paying attention and they had thrown rocks at her car. There were dents and cracked windshield. She already paid deductible and had windshield replaced. But now mentioned that for the dents she would possibly go after our home owners insurance since it took place at our home. Curious as to what our options are?