Is my sister being rude?

My bf & i are 18 and he's coming over and making dinner for my family and i. My sister is 15 and just started high school. Today my bf texted me saying "tell ur sister i do expect her to be there for supper" so i told her & she said she would. Now she's saying she isnt gonna be there because she... show more My bf & i are 18 and he's coming over and making dinner for my family and i. My sister is 15 and just started high school. Today my bf texted me saying "tell ur sister i do expect her to be there for supper" so i told her & she said she would. Now she's saying she isnt gonna be there because she has a football game to go to tomorrow. I know those are fun but shes been to a bunch of them already & she has the rest of high school to do that. I think my bf told me to tell her cuz he's noticed she's with friends more than she's at home. Do you think she's being rude or just being a teenager? It irritates me that she can't be home for just one night. What should i tell my bf?
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