Question about continuity
When the son visits his parents' house only his mother is home, he tells her the button on his coat has come off and she begins to repair it for him, the son goes to sleep on the bed. Next shot the mother is outside with a stove or cooking pot and the father is in the house getting ready to go to work. Later the father brings home two men who are to buy one of his wife's rugs, as they enter the house the son is no longer present and the men sit on the bed. In the following scene the father returns home, the mother is repairing the coat and the son is sleeping on the bed. The father asks "when did he arrive?" and the mother says, "Just now".
Can anyone explain this strange continuity? Is the episode with the rug a flashback or something?