The Unborn Son of Greg Heffley is a character imagined by Greg Heffley in The Ugly Truth, when he was mentioning what he would do if he was 95 years old. There is another unborn son of Greg Heffley shown in Hard Luck, and he is about 6-8 years old by how he looks, when he explains that he thought that he would end up in a good relationship unlike Rowley. He looks identical to Greg's younger self. There also another who looks like a new-born baby and he also has a daughter.