Registration of adoption deed

Since they might have adopted socailly the child during 1970's,but now they want to endorse the adoption  legaly by way of an Adoption deed, as such there is need to traverse through the act; 

Need to go through section 10 to 16 of the THE HINDU ADOPTIONS AND MAINTENANCE ACT, 1956

10. Persons who may be adopted-

11. Other conditions for a valid adoption-

12. Effect of adoptions-.

13. Right of adoptive parents to dispose of their properties-

14. Determination of adoptive mother in certain cases-

15. Valid adoption not to be cancelled-

. 16. Presumption as to registered documents relating to adoptionWhenever any document registered under any law for the time being in force is produced before any court purporting to record an adoption made and is signed by the person giving and the person taking the child in adoption, the court shall presume that the adoption has been made in compliance with the provisions of this Act unless and until it is disproved. 

There is no such tume limit for the registration is prescribed.