下表是对某一家庭成员某些性状特征的调查结果，请分析调查结果并回答有关问题：
性状
父亲
母亲
女儿
耳垂
有耳垂
肤色
正常
白化
—How did your uncle learn to play the guitar?
—By _______.
____ ____juice did Dave buy for his children?
