Harry Potter presents a curious case when it comes to his wizarding ancestry. On the one hand, he can be considered a pure-blooded wizard since both his parents Lily and James, were a witch and wizard, respectively. But on the other hand, Lily was born in a muggle family to Mr. and Mrs. Evans, and so certain purists would consider Harry a half-blooded wizard at best.
Fortunately, neither Harry nor his parents ever cared about such labels. On their part, Mr. and Mrs. Evans were thrilled to discover one of their daughters was a witch and supported her wholeheartedly. Unfortunately, this love apparently did not extend to their muggle daughter Petunia, who felt othered and rejected while her parents showered all their love on Lily.
Since all we have is Petunia's word on the subject, it is difficult to ascertain whether Mr. and Mrs. Evans were truly neglectful towards her, or Petunia was being overly sensitive and consumed by jealousy towards her sister. In any case, when Harry gazed into the Mirror of Erised in his first year at Hogwarts, he saw his grandparents along with the rest of the family he had never known smiling and waving at him lovingly. The family was reduced to just Harry's parents in the film adaptation.
