uchi/soto (内/外, in-group / out-group)

Home is home, outside is outside.

"Ah, y-yes... sorry, Sis Rei." "Hey! Relatives or not, Im your senior physician here, got it? On hospital grounds, you need to keep things properly professional."

My mother is unable to come visit.

My father will be waiting for your call tomorrow.

She did all sorts of kind things for him.

She is ashamed to tell the story to anyone else.

She took a walk with her father this morning.

She knows your mother well.