Brooks Nader does not mess around when it comes to her Poppi - and she's willing to slap sister Sarah Jane Nader to get what she wants. In Us Weekly's exclusive first look at a new social campaign for Poppi, Brooks, 28, and sisters Sarah Jane, 23, Mary Holland Nader and Grace Ann Nader all gathered around a couch to celebrate "Sismas" - a holiday Brooks hosts and described as "a time for all of us to get together, have our favorite food, have our favorite drinks, get a little drunk, spill all the tea. The usual sister stuff.