Re: i felt confused between these sentence
Polyester, I do not mean to sound unkind, but it seems that Harry Potter may be a bit too advanced for your level of English right now.
Uncle Vernon was afraid of these people, but he was more angry than afraid.
Aunt Petunia was afraid that her neighbors would see these people coming to her house and that her neighbors would think badly of Petunia because she knew them and let them in her house.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.