Vernon and Petunia Dursley were normal. They had normal jobs with a normal house and lived in a normal neighborhood. And they would like it to stay that way.
The Dursley's were normal up until Dudley was just one year old. A knock on the door sent their world into a complete tailspin. Normal was the exact opposite of what the other side of the door held. The other side of that door held a Potter. Why is that so bad, you ask? The Potters were a wizarding family. Petunia's sister was a witch and married a wizard named Potter and they had an atrocious young boy named Harry.
And it wasn't the Potter family that was there. It was Harry. Wrapped in a blanket. With nothing more than a letter to explain why that little bundle of evil was sitting on their porch. All the letter said was Lily and James were murdered, and they must keep Harry with them. Make him feel at home. And if they gave Harry up for adoption, the world as we know it would come to an end.
The Wizarding World scared the ba-jeebers out of Vernon, so they decided to take the little brat in, not wanting to know what the consequences were if they didn't. They fed the little runt when he needed to be, gave him a blanket to sleep on, and gave him all of Dudley's old clothes, only if he would clean, cook, and do all the other things to traumatizing for little Duddykins and his parents to do. The Dursley's never wanted Harry to know about the Wizarding World. It would affect their semi-normalicy. And in no way did they want that affected. No way.
But apparently the stupid old man… Bumbleebore? Was that his name? Oh, whatever. The stupid old Headmaster of Hogwarts had different plans for dear old Harry. Letters. Tens. Hundreds. Thousands. Too many to count. Through the mail. Through the chimney. Through the door. Through the windows.
Well, long story short, Harry ended up going to Hogwarts after the Dursleys were attacked by this ferocious beast that some would like to call a human. Some.
The brat came back every summer, and it was pure torture. Having to put up with all his wining and nightmares, when were they ever supposed to sleep? Never. Well, in Harry's opinion that was when. After his first year, it was "Quirrel? NO! IT'S SNAPE!". Second year? "Ginny please don't die! Come on. GINNY! NO!". Third year was probably the summer we got the most amount of sleep. It was mostly "Why Sirius, why can't I come with you?". Fourth year was terrible. "Cedric. CEDRIC. NO! CEDRIC WAKE UP! I got you killed. NO!" or "No. No. NO. DON'T KILL ME. NOOO!" . Fifth year was a bittersweet dilemma. He never used his owl (which we prohibited him from doing so, but he still did it on the other years), he never ate (saved the Dursley's money), and just sat in his room. So needless to say, Vernon and Petunia were very happy with his behavior during the day. During the night? Not so much. "It's all my fault. ALL OF IT,", "Sirius! NO! NO! NO, DON'T DIE!" , or "Everyone I love… gone". It was quite pathetic really. After his sixth year, it was all about Bumbleebore and this man named Snape. Weird names in the Wizarding World if you ask Vernon. That was his last summer there. He warned them to leave or else they would die, they did as they were told, and when they got back to their house, it was all in ruins. Go figure.
Only twice did they ever get a letter from Harry. One was to inform them that Voldeymart was killed, so they could move back to Number 4 Privet Drive, and the other was to inform them that he was getting married, and Vernon and Petunia were in fact not invited to the wedding, but Dudley was.
Dudley now saw Harry quite often; they were actually on speaking terms. They visited each other, and Dudley even learned to accept his way of living. Vernon and Petunia never heard from Harry again, until that one day… Well, just see for yourself.