Social class and culture play a large part in how our families develop. A large part of social class is determined by our financial status. If there are financial difficulties, that can cause stress and contention within the home. On the other hand, a family that is wealthy may put more value and importance on money than on other values or ethics.
The biggest influence on the family can be the culture in which a family is. This can be culture due to religion, politics, or the area that you live. Traditions and habits can develop through out entire communities.
I noticed this while spending time in Brazil. I was in the Northeast, which is known for being the poorer and less educated part of the country. The people there are very nice and friendly, but when it comes to families, they are very casual. Marriage is not common at all, and the family is often dispersed and children go to live with other relatives at a young age.

If we want to develop a certain type of family, we need to be aware of the culture around us, and make sure it's conducive to the family we want.
As previously mentioned, religion can play a large role in the type of culture we develop. It can be one of the most secure sources of creating a well-balanced environment in which to raise our children.