My Grandma's Partner Seems Possessive, I'm Worried?

My aunty called my mom and she told us that my grandma's boyfriend (My grandpa past away a long time ago) is a little bit possessive because he stormed into my aunties office and demanded to know where she was, which she was in the city with my aunties husband (My uncle) in the hospital because he was in an accident. We live two provinces away from where this is all happening and I'm really worried because my grandma is elderly and can't take abuse, and shouldn't be abused at all. I love her very much and I have no idea what I should do... This guy is a Berthelette, and where I lived Berthelettes were known for beating their wives and children. I'm so worried....