In “standard American English,” meaning, essentially, schoolroom English, the second person pronoun is “you,” for either singular or plural. Talking to your spouse? Use “you.” Talking to your spouse and his or her entire family, at the same time? Use…well, also use “you.” It is a huge, strange weakness in American English: when someone is talking to a group of people, we have no way of indicating whether the speaker is talking to only one person or the entire group. Peeking your head out from the kitchen at a dinner party and asking, “Hey, can you get me a drink?” is likely to score you a look of confusion. Who are you talking to, exactly?
Read more at the Source: Y’all, You’uns, Yinz, Youse: How Regional Dialects Are Fixing Standard English | Atlas Obscura