Hellooo!!
Firstly, I hope your family is doing okay despite the circumstances
I think at its core, mitigating circumstances are anything which could have impacted your performance. Most policies also don't require one specific type of event, they just look at whether it caused significant stress/worry that affected your ability to perform. In my personal non-grad rec opinion I think having immediate family in an active war zone is something which would cause a lot of stress and impact your performance.
I would definitely mention it