Everything you said about the fees is true. I think Pedro is not the sharpest tool in the shed so he would be lost reading the forms. The citizenship not is complicated and he could do it himself but the forms to petition his mother and sister, he wouldn’t be able to. I did all my paperwork myself for my own green card too and saved a lot of money ( it only cost my $550 back then) but I have friends quoted 5k by lawyers for their paperwork.
One thing that the lawyer said that is not true is that Chantal needed be present for the interview. When I applied for mine which was also marriage based, my husband was not present. I drove by myself and had the interview alone. But I had all the required proof that I was married in good faith (still am!) Funny thing about my interview is I was 36weeks pregnant at the time and the officer was super worried that I could go into labor there. Apparently, he had that happened to him before. Thankfully, that was not the case and I made it home safely. Unless things have changed, I think that was sprinkled there to create more drama.