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
The people who keep pets in this community are usually the residents with better living conditions
 This shows that keeping pets helps to improve the happiness of family life