You use" " which are called quotation marks
Is this about a book orrr what? like a story?
Answer:
Echidna is daring Percy to prove that he is indeed Poseidon’s son that he shares Poseidon’s bloodline, or family relationship.
Explanation:
Believe me this is an A answer. I was going through the same as you lol.
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 .