I live in the US (Massachusetts) and I jointly own a house, along with my wife and her parents (who live with us). I have noticed a frustrating trend recently with the other co-owners making repairs/modifications without informing me beforehand or asking my consent. For example, the other week my Father-in-law made a new doorway in the fenced storage area under the deck in our back yard, which I was not consulted about. I have tried discussing it with them on several occasions, but my protests seem to be falling on deaf ears.
So, I am wondering if I have any legal options to prevent them from unilaterally making modifications to the house? For example, could I apply for a court injunction to prevent them making modifications without my express consent?
Edit: Of course, they are my family and I'm not saying I would like to see them dragged off and put in jail/punished. But, if push comes to shove and the 'diplomatic' approach fails, I am thinking that a court summons or some type of official court order might have a 'wake up and smell the coffee' effect of showing them that I am dead serious about asserting and defending any legal rights that I (may) have, as a joint owner.