Five cousins (V-5, V-7, V-8, V-9, V-10) and maternal uncles (IV-3, IV-9) were also followed for epilepsy. IV-3, IV-9, V-5 and V-8 died respectively at four, seven, three and two years. They had all neonatal hypotonia, psychomotor delay and epilepsy beginning at 6 months old.