Here are the combined sentences:

16. Family members care for each other. **It is essential for family members to care for each other.**

17. Families are the place where we learn values, skills, and behavior. **We are aware that families are the place where we learn values, skills, and behavior.**

18. Parents should guide their children into the world outside the home. **It is certain that parents should guide their children into the world outside the home.**

19. Strong families have a sense of loyalty and devotion toward family members. **We are conscious that strong families have a sense of loyalty and devotion toward family members.**

20. The family is a place of shelter for individual family members. **It is sure that the family is a place of shelter for individual family members.**