s.11 Annulment of marrige, void ab initio, marriage is void from the beginning, as conditions u/s.5 not complied
s.12 Nullity on thegrounds of cheating by suppressing material fact, pregnancy of the spoue at the time oif marriage from other person
Annulment is not possible
Is your case that the son born is from somebody else and you came to know only after thebirth
Pl answer these quetions nad put yor query again