A division bench of Apex Court held that,

From Para 45,

45. Despite concurrent findings of three courts as to the legitimacy of the Respondent, he and his mother maintain and proclaim to the world that the Appellant is his biological father. It must be underscored that theAppellant has maintained a consistent stance across all fora that he never had sexual relations with the Respondent’s mother. In fact, the dispute was assumed to have been put to rest in 2011, providing some relief to the Appellant, only to be reopened in 2015, once again making him face the brunt of the allegations. This constant pendulum-like state of affairs and unsubstantiated allegations must have, undoubtedly, had an adverse effect on the Appellant’s quality of life. In this backdrop, an order necessitating a DNA test based on mere allegations of adultery, would ultimately violate the Appellant’s right to dignity and privacy.

From Paras 69 and 70,

69. This convoluted case, spanning over two decades, has no doubt taken its toll on the parties involved and other relevant stakeholders. Given these
extenuating circumstances, at this stage, it must be closed for all intents and purposes.
70. Accordingly, we deem it appropriate to allow this appeal and set aside the Impugned Judgment of the High Court dated 21.05.2018 and of the
Family Court dated 09.11.2015, with the following directions and conclusions:
i. Legitimacy determines paternity under Section 112 of the Indian Evidence Act, 1872, until the presumption is successfully rebutted by proving ‘non-access’;
ii. The Munsiff Court and the Sub-Judge Court possessed jurisdiction to entertain the Original Suit, which dealt with the question of the legitimacy of the Respondent;
iii. The Family Court, Alappuzha erred in reopening the Maintenance Petition when the self-imposed condition was not satisfied;
iv. The impugned proceedings, initiated by the Respondent, are barred by the principle of res judicata;
v. The proceedings in MC No. No. 224/2007 before the Family Court, Alappuzha stand quashed;
vi. Any claim by the Respondent based upon the perceived relationship of paternity qua the Appellant, stands negated; and
vii. The Respondent is presumed to be the legitimate son of Mr. Raju Kurian.

Impugned Judgment:

https://www.casemine.com/judgement/in/5e977c0b4653d048ca2bb2dc