559. The following may be judicially declared eligible for adoption:(1) a child over three months old, if neither his paternal filiation nor his maternal filiation has been established;
(2) a child whose care, maintenance or education has not in fact been taken in hand by his mother, father or tutor for at least six months;
(3) a child whose father and mother have been deprived of parental authority, if he has no tutor;
(4) a child who has neither father nor mother, if he has no tutor.