What happened to the Dursleys at the end? After the death of Voldemort, Order of the Phoenix brought back Dursleys from their protection to their original home in Privet Drive. Harry never went back to Privet Drive after his 17th b'day.
Uncle Vernon and Aunt Petunia (who had secretly longed for magic herself) didn't see much of their nephew, for obvious reasons. Dudley, on the other hand, reunited with Harry a few times so that their children could play together. Their relationship was awkward, but this was a major change from when they grew up.
Dudley did, Petunia might've but Vernon, No. They saw him as burden, the freak in the cupboard. Some on here like to play down Harry's abuse at the hands of the Dursley's but the truth is they never loved him.
His last words in the movie are, "I still don't understand why we have to leave." But he also has a deleted film scene where he has a final conversation with Harry, and his last line is, "I don't think you're a waste of space." In the final book, Dudley's last line is simply, "See you, Harry."
Harry and Dudley maintained a relationship:
The once-estranged cousins made amends after Dudley's admission that Harry wasn't a “waste of space” and remained on “Christmas-card terms” as they grew older. However, their relationship never blossomed into a true friendship.
But Aunt Petunia receives a Howler – a special enchanted letter – that says only, "Remember my last, Petunia" (2.217). By the final chapters of Book 5, Harry discovers that this Howler was sent by Professor Dumbledore to remind Aunt Petunia of her oath to give Harry a place to live.
Harry describes Umbridge to Sirius Black, saying that she's vile enough to be a Death Eater, despite not being one. Umbridge is also depicted to be a prejudiced person, despising half-breeds and Muggle-born witches and wizards to the point of firing Hagrid due to his half-giant birth status.
While Vernon consistently praised his son as if he was extremely masculine and robust, Petunia infantilised Dudley, calling him "Diddykins" well in to his teen years, appearing heartbroken to have to put Dudley on a much-needed diet and even bursting into tears when Dudley showed marginal affection for Harry.
After Dudley and Harry encountered a dementor in Order of the Phoenix he became much more compassionate.
"The first meeting between Lily, her boyfriend James Potter, and the engaged couple, went badly, and the relationship nosedived from there," Rowling revealed. Rowling adds that Vernon hated Harry because he saw father James in him, much in the same way that Snape does.
She made a promise to Dumbledore
As Lily's last remaining blood relative, if Petunia were to take Harry in it would seal the enchantment and provide him with protection from Voldemort. This would last as long as he could call the place where his mother's blood existed his home.
Aunt Petunia was the sister of Harry Potter's mother, Lily, and they didn't get along. The reason for this estrangement actually makes a lot of sense. One of the defining traits of the titular character of the Harry Potter franchise is the fact that the young hero is an orphan.
One of the most beautiful moments in the entire Potter series came from when Dudley and Harry were able to make amends. This occurred in Harry Potter and the Deathly Hallows when Dudley told Harry that he didn't think he was a waste of space. They even shook hands!
Petunia never showed any love and affection at all towards Harry because he reminded her of Lily and the wizarding world.
Hagrid appears at the hut and gives Harry his letter in person, leading Petunia to admit she knew Harry was a wizard and that she and Vernon had sworn to stamp the magic out of Harry when they took him in. She claims that her sister's (Harry's mother's) magical abilities made her a freak.
The fan asked the author if Aunt Petunia was a Squib (a non-magical person who is born to at least one magical parent) and Rowling replied: "Good question. No, she is not, she is not a Squib. She is a Muggle.
Lily Josephine Evans (30 January, 1960–31 October, 1981) was an English Muggle-born witch, a daughter of Marion Evans and John Evans, the younger sister of Petunia Evans and elder twin sister of Willow Evans.
The two children of Dudley Dursley and his wife were Muggles. They were occasionally visited by their magical second cousins, the two sons and daughter of their father's cousin Harry Potter. It is unknown whether they knew of their cousins' magical heritage.
Peter Pettigrew (a.k.a. Wormtail) is the only Death Eater known to have been in a House other than Slytherin (Gryffindor) while at Hogwarts. There, he was a close friend of Sirius Black, James Potter, and Remus Lupin, although he was the least intelligent and least talented of the group.
With the fall of Lord Voldemort, Dolores Umbridge was put on trial for her enthusiastic co-operation with his regime, and convicted of the torture, imprisonment and deaths of several people (some of the innocent Muggle-borns she sentenced to Azkaban did not survive their ordeal).
No doubt Petunia would have been saddened by the news of Lily's death but those complicated emotions – grief, regret and unresolved jealousy – were probably buried in the distractions of housework, gossip and pandering to her son Dudley's every whim.
'Remember my last'
Petunia's disdain for Harry was most likely born from a long-standing jealousy of her magical sister, Lily. A Howler from Dumbledore, addressed to Petunia, said 'Remember my last' – no doubt referring to the letter which he left with baby Harry, on the doorstep of Privet Drive.
In Harry Potter and the Order of the Phoenix, Petunia Dursley receives a Howler, later revealed to be from Albus Dumbledore himself, shouting only the words, “REMEMBER MY LAST, PETUNIA” (OoTP 40).