filiolus

fīlĭŏlus, i, m. dim. [filius],

a little son : filiolo me auctum scito salva Terentia, Cic. Att. 1, 2, 1; Plaut. Capt. 4, 2, 96; id. Truc. 2, 8, 10; 4, 3, 31; Juv. 6, 390 al.