He's the child of the now-deceased Remus Lupin and Nymphadora Tonks ... It's possible that J.K. Rowling's tweet about Teddy Lupin being head boy was done with this in mind -- she likely knew ...

Remus Lupin was first introduced in Harry Potter ... he was brought in for questioning about the murder of two Muggle boys. Fenrir pretended to be a Muggle, but Lyall realized that Fenrir was ...