 He was the first-born son of the previous head Carlos O'Neill and wife Ana João Torlades.José Maria O'Neill was the Main Manager of the "Casa Comercial Torlades", Consul-General of Denmark, Belgium and Greece in Lisbon, a Capitalist, a Commander of the Order of Christ and a Commander of the Royal Order of Our Lady of Concepcion of Vila Viçosa, etc., who also received Queen Maria II of Portugal and King Ferdinand II of Portugal in his House in his Farm (Quinta) of as Machadas, at the term of Setúbal, etc.He married in Lisbon, São Paulo, 11 December 1824, thus legitimizing their already born children, to Ludovina de Jesus Alves Solano (Évora, São Mamede, 1790 - 22 December 1856), daughter of António Alves Miguéis and wife Inácia Solano, of Spanish descent, and had ten children