Dr. Jose Rizal, Philippine national hero, the 7th of 11 children, and Cardinal Jaime Sin, charismatic leader of the People Power Revolution, the 14th of 16 children, are two of the most famous achievers among large Filipino families. The entire country would be drastically different in its governance and its ethos, if these two were never born, if their parents decided not to have many kids.
A friend, Jack Ealdama, an enthusiast for large families, put together a list of recent high achievers who come from a big brood: from an mixed martial arts champion to a board topnotcher, from an Olympics medalist to a summa cum laude graduate. With his list, he supports the research results on the benefits of being open to the gift of children.
From what I have gathered (see sources at the end), research and experience has shown the following benefits of large families: