Is Harry Potter going to have a son?

Answer 1

In 'Harry Potter and the Deathly Hallows' - the book, I mean, of course - after the story ends, it has a brief chapter named, 'Nineteen Years Later,' where it reveals Harry has married Ginny and they have three children - in order of age, there is:

James Potter

Albus Severus Potter (starting his first year of Hogwarts)

Lily Potter.

So, to answer your question, Harry does not only have one son, he has two, and a daughter.

Ron and Hermione also have children - two, Hugo Weasley and Rose Weasley.