Have you ever wondered why Carl is mean to Russel when he meets him in the animated movie "Up"? If you think "because he's grumpy and old", you're wrong because the reason is much sadder. After he married Ellie, she had a miscarriage and they found out she was infertile. So they were never going to have children. Carl probably spent decades after that convincing himself that he didn't want to have children. That's why Ellie's message to Carl after her death is even more meaningful. Because she didn't just want the man she fell in love with to live his life, she wanted him to stop fooling himself and to be free.