What are good and bad things about Jonas' family?

This is such a good question!  We tend to think that everything in The Giver is bad, but that is a hasty judgement.  Jonas' family is good because it provides him with a stable home environment. But it is bad because it follows all the Rules to promote Sameness and does not provide Jonas with love.

The family provides Jonas with two parents and a sibling, which gives him stability at home.  There are familial routines, which are good for children.  For example, the family always has dinner together and a sharing of feelings at the end of the meal.   The children are thus encouraged to express themselves in some ways, which is also good.  There is no drama at home, and since drama is so very bad for children, this is a positive aspect of Jonas' home life. The parents never argue, and it is always fairly harmonious.  The parents also seem to take the time to promote some empathy in their children, as they do in the scene in which they help Lily to understand the point of view of a visitor from another community.  Considering all that is so wrong with the community, this kind of stable upbringing is nevertheless important for children.

On the other hand, Jonas' parents go along with the community program completely, never questioning the rules, even to the point of Releasing an innocent infant whose problem is simply being the smaller of twins. It is difficult to know whether or not to blame them for their conformity, since they, like everyone else, seem to take medication that represses their emotions, but their extreme conformity is not a good thing, since they are raising children to not question anything.

Probably the worst and saddest attribute of Jonas' family is the lack of love.  When Jonas learns about love for the first time, from the Giver, he goes home and asks his parents if they love him.  The best his parents can give him is to say that they enjoy him and take pride in his accomplishments. They are amused at his use of the word "love," which they characterize as "a very generalized word, so meaningless it's become almost obsolete" (127), and later in the conversation tell him it is "inappropriate" (127) to use this word. Now that Jonas has experienced the emotion of love, from the Giver's memories, he understands that this is missing in his life.

All in all, the parents are probably doing the best they can within the limitations of the community.  They are providing Jonas and Lily with stability. But they are raising children who will be conformist rule-followers.  And they are raising children without love.