A community recently conducted a survey on the relationship between pet ownership and happiness in family life. The survey interviewed 100 families, including the type of pets, the time of keeping pets, the education and occupation of family members, and so on. The results show that the happiness of family members in families with pets is generally higher than that in families without pets. This shows that keeping pets helps to improve the happiness of family life.
The statement 'Families usually keep pets because their members have plenty of time and have a high sense of happiness in family life' most weakens the above argument.