Which of the Following Statements About Sibling Relationships in Later

Which of the following statements about sibling relationships in later life is true?

A) sibling ties tend to be reactivated by the declining health of the parents
B) families with two brothers tend to share caregiving duties most equitably
C) sons in brother-only families tend to be more proactive than reactive in caring for elderly parents
D) in families with brothers and sisters, the brothers are more likely to be engaged in parental caregiving
E) sibling relationships over the life course have been conceptualized as "from allies to rivals"