Answer:
Simple: Very Important
Explanation:
The value of family in american culture is very valuable,Obviously no matter where it is very important. Currently people would obviously get offended if you say anything rude about parent's in american culture many american's consider very valuable and many thing's occur nowadays less value has been shown. For example now in history divorces have been more common than ever in history due to complex psychological changes in human behavior as of recently and other factors.
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If Ellie prefers one of her brothers, it is because that brother treats her well and she identifies with him. In this case, we can say that Ellie and Billy's personalities are similar and match each other. This makes her feel a strong sympathy for Billy that she does not feel for other brothers.
It would likely be the third one: to focus research by identifying the what, who, why, and how.