Sarah grew up in the first set of companionate families that emerged at the turn of the 20th century. compared to her grandparents, her parents were likely to be

more focused on the importance of mutual affection

Explanation: Mutual affection describes the feeling of affection that people persist toward each other in mutual manner. Sarah being in the first set of family is close to her parents and grandparents but during the time of 20th century the phase was not good for the affection(due to many war sessions) .

The nature of being compassionate is more likely to be in the parent of Sarah than being in her grandparents.Thus her parents persist the feature of having more mutual affection

no , per capita income is not a true measure of the development because: -it only tells us about average income not how income is distributed among the people.it only give us an idea of the economic aspect.it is only at the qualitative basis.moreover, income is not only the way of development other factors are also as much as important as income.