It depends on the specific situation. If the father can't attend his son's wedding due to work reasons, but has already communicated with his son, fiancee (or others), it will generally not affect. A father can express his blessing and support to his son in other ways, such as writing a congratulatory letter and recording a blessing video.

However, if the father fails to communicate with his son, fiancee (or others) in advance, or fails to give a reasonable explanation, it may cause some unpleasant emotions and affect the atmosphere of the wedding and the harmony of the family. In this case, it is suggested that the father communicate with his son and fiancee (or others) as soon as possible to explain his situation and minimize the negative impact.