A family is experiencing changes in their lifestyle in many ways. The invalid grandmother has moved in with them. The couple have a 2-year-old son by their marriage, and the wife has two children by her previous marriage. The older children are in high school. In applying systems theory to this family, it is important for the nurse to remember which of the following principles?
A. The parts of a system are only minimally related.
B. Dysfunction in one part affects every other part.
C. A family system has no boundaries.
D. Healthy families are enmeshed.