Here are the correct options underlined to complete the sentences:

1. With less life experience than older family members, the younger generation **should** realize that differences between generations can be positive.
2. Children commonly feel upset when they **have to** make their parents understand some issues on which they have different points of view.
3. Parents **have to** make their children realize that they care about in their children’s interest.
4. Parents **shouldn’t** say things like ‘when I was your age’.
5. Children **shouldn’t** disrespect the elders and their parents.