Mr. Smith is an alcoholic. There is an unspoken rule in his family that everyone should work to protect his emotions. This unspoken rule exerts significant influence on patterns of interaction in the family. According to Minuchin, this unspoken rule is an example of:

hereditary rules

Explanation:

Some addictions are family genetics and as well as many persons in that family might suffer the same problem, this subject is very difficult to talk about or to share advises, so this behavior of protecting emotions and do not talk about alcoholic addiction can be seen as an unspoken rule.

there is an explationation of this on a site called crash   course world history 1

intimacy, passion and commitment are the components of a interpersonal relationship emphasized in the triangular theory of love by robert sternberg.

the triangular theory of love says love can be comprehend as this componest form the vertices of a triangle.  

intimacy relates to feelings such as of closeness and connection;

passion relates the drives that brings people together, as physical attraction.

commitment relates to the being in a long-term relationship.