1. Near the end of the "When does familiarity..." article, the authors identify several principles which help explain why sometimes familiarity promotes liking and sometimes undermines liking. Use two of those principles to explain why there is often love in families, but also why there is sometimes hate within families.
2. Use two of those principles (same or different ones used in Question 1) to suggest why we are glad to help some people but are very unwilling to help others.