It sounds like you want a detailed explanation of the situation. Here is a fuller version:
Clara had been away from home for four months because of a business trip. During that time, she was likely focused on her work responsibilities and was separated from her family. On that day, at around 11:00 a.m., she unexpectedly arrived back at her house.
What made her return unusual was that she did not inform her husband or her son beforehand. She did not make a phone call, send a message, or give them any warning that she was coming home. Because of this, her family was probably surprised when they saw her arrive. Her decision to return without notice could have been for several possible reasons: she might have wanted to surprise them, her travel plans may have changed suddenly, or she may have had a personal reason for keeping her arrival private.
The event creates a moment of surprise and emotion: after being away for months, Clara was finally reunited with her family, but the lack of communication before her arrival meant that her husband and son had no time to prepare for her return. Their reactions could range from happiness and excitement to confusion or concern, depending on the circumstances and their relationship.
If this is from a story or a comprehension question, more context would be needed to explain why Clara came home unexpectedly and what happened afterward.