Ronaldo de Assis Moreira was born on 21 March 1980 in Porto Alegre. He spent his childhood in one of the poorest districts of the city - Vila Nova. He lived there with his father João shipyard worker and former football player, mother Migeuliną, saleswoman, a trained nurse and her two older siblings, Roberto Assis, the brother and sister Deisi. He then also in Futsal.
Roberto was a professional football player. M.in played in Italy. With his earnings, the family moved from the poor district of the luxury villa with swimming pool. It is in this pool João died of a heart attack. Ronaldinho probably does not remember exactly the father because he was only 8 years at the time of his death. Since then, very lived with his mother Migueliną, while the father took the family's older brother, Roberto. This, in turn, when he had to prematurely end his playing career due to injury, he was an agent of talented younger brother.
25 January 2005 the world came João - son of Ronaldinho and Janainy Natielle Viany Mendes. Roo got the name of a deceased grandfather.
At the end of 2006, Ronaldinho opened in São Paulo Institute of Ronaldinho. Children from poor families can instantly improve their football skills.