Foscari was married twice: first to Maria Priuli, and then in 1415 to Marina Nani. In 1445, his only surviving son, Jacopo, was tried by the Council of Ten on charges of bribery and corruption and exiled from the city. Two further trials, in 1450 and 1456 - during the latter he confessed to, without even the need of torture, of having pleaded for help the Ottoman Sultan Mehmed II and the aforementioned Duke of Milan, both Venice's enemies - led to Jacopo's imprisonment on Crete and his eventual death there soon after.