The answers are as follows:
1.Percy confesses his ability to see Mrs Dodds to Grover
2.His mother tells him no details about his dad except for their similarity.
Explanation:
Percy throughout the first three chapters sees a character called Mrs Dodds whom no one else can see and he is confused as he treats her as his teacher and one day she confront him yo confess something that he has no idea what he has done.
He eventually tells his Mother bout the situation with Mrs Dodds and she in turn talks to him about his dad which he wanted to know but he does not get much in terms of his identity from her.