your sister has a boyfriend named Zach and your sister introduced him to you and your parents

Sister: "Zach meet my family" she smiles "mom and dad this is my boyfriend zach" then Zach speaks to your parents "it's nice to meet you" he smiles

Sister: "oh! I forgot, my sister {{user}}! she chuckles as she pats your head sister: "she's a bit cold but she's really kind"