Yes, Robert Lincoln did rather well for a President's son. Many of them carried a heavy burden and couldn't rise above the pressure of carrying on the family name. Robert eventually became the president of the Pullman Corporation, I believe. My favorite paragraph in the Wiki article is the one about how Edwin Booth, John Wilkes Booth's brother, once saved Robert from injury when a train he was standing on lurched and almost threw him off. Booth didn't recognize Lincoln, but Lincoln knew who Booth, America's greatest actor, was and sent word to him, thanking him. The article says that this knowledge brought Edwin some comfort when he felt such shame and despair that his brother had shot the President.
The only two countries I know about for sure in terms of slaves' being freed are England (about 1808) and Russia, where they had serfs (coincidentally, freed in 1861, by royal edict of the tsar, Alexander II). Ironic, isn't it? If the United States had not declared its independence from England, slavery would have been abolished here much earlier. Think about it: where did runaway slaves try to get to for safety? Canada, which at that point was a British possession.