Respuesta :
I would say the correct answer would be Alex is his brother since the way the statement is worded, first it talks of his sister, then of his brother Jerry and next his sibling, Alex so since it comes right after the mention of his brother Jerry I would think Alex would be a brother though I can't prove it .
(1.) Alex doesn't live in Texas
To answer this question you shouldn't even need the actual dialogue. The beginning of the sentence starts with Grace. She is the subject of the sentence and the one doing the actions of meets and says. Grace is a girl. Options 2, 3, and 4 are all wrong because they use the pronoun "his". The siblings are all Grace's siblings.