No resentments run deeper than the ones between siblings. There’s just no getting away from the shared history with your brother or sister, and it’s never the same experience or memory that flares up feelings of anger. I know I’ve been in arguments with my little brother where he felt slighted by something I barely remember, and vice versa. Those resentments are at the core of Appropriate, the dark new drama from playwright Branden Jacobs-Jenkins. With bluntly effective dialogue, he complicates a fractured family history with queasy feelings about history and racism. While it ends on an allegorical note, the strong characters sit comfortably along Jacobs-Jenkins’ loftier ideas.