Genesis 43:30,31

‘And Joseph acted hurriedly, for his heart was filled with longing for his brother, and he wanted somewhere to weep, and he entered his private room and wept there. And he washed his face, and came out, and he restrained himself and said, “Serve the food.” '

The brothers are totally unaware of his feelings. They see him leave for a while and little do they realise that he has gone to weep. But he releases his feelings in his own private apartments and then hides the evidence, washing his face and composing himself. Then he comes out and commands that the meal be served.