Perjury/defamation

When U are saying living with her children,why do U want to opt for DNA?

According to section 468(2) (C) of crpc the limitation period to file perjury or defamation is 3 yrs.

Sir, she is leaving with her children's but (1) She has not made any documantry proof there and in the court she clearly denies that she do not know these children's and that man with who me she is leaving (2) when I produce birth certificate and school certificate of the children she replies that the mother of the child is some one other whose name is similar to me.(3) She herself has made her ration card and vote in her parental village.(4) No one from her own village and her new in laws village is ready to say any thing about her and her child in the court but outside court they say every thing.(5) When I produce certificate of her job even then she denies that she is not working any where and court accept her words and fix maintenance money. For these reasons I want to request the court to conduct DNA test. But the question is how can I call her childs in the courts, to whome shall I serve the summons as she is saying that she do not know them. I am facing these difficulties from last 14 years. Pl suggest me.