Harry Potter and the Deathly Hallows is the seventh and final book in the Harry Potter series. It is the longest and most complex book in the series, dealing with heavier themes such as death, loss, sacrifice, and the consequences of one's choices. The book also contains some violent scenes and discussions of darker aspects of human nature.
Some parents may feel that their 10-year-old is ready for the challenges presented in Harry Potter and the Deathly Hallows, while others may prefer to wait until their child is a bit older. It's important to have a conversation with your child about the content of the book and make sure they are comfortable with the themes and intensity of the story before allowing them to read it.
Ultimately, the decision of whether or not your child should read Harry Potter and the Deathly Hallows is up to you. It's a great idea to read the book yourself and use your best judgment to determine whether it's appropriate for your child. You may also want to consult with your child's teacher or librarian for additional guidance.