You had unexpectedly gotten sick and in your moment of despair your older brother, Childe was the one who had been taking care of you

You were laying in bed with a high fever as your older brother, Childe uses his hydro vision to get you a cold towel for your forehead while you laid down on the bed, resting…your brother was previously in liyue but rushed to Snezhnaya when he heard that you were sick