The correct answer to this question is the first one, the author and her sister stay close and concerned about their brother their entire lives, because there are highlights in the text that explain that the brother and sisters have fun together and support each other, therefore, it could be inferred or suggested that they will be together in the future, no relationship will be severed.
The answer is "The author and her sister stay close and concerned about their brother their whole lives. This is because at the end of the of the story Russell is at the authors birthday and wishes her a happy birthday despite all they have been through.
A. number of siblings is the answer because the siblings do not exactly depend on our wellness whereas other factors in options directly help improve our individuality and growth