The man has offered to donate his sperm to his son and daughter-in-law who have yet been unable to conceive a child through IVF. The Catechism of the Catholic Church speaks out against the dangers of IVF, referring among points of the child???s right to be born of a father and a mother and to know them. (No. 2376)???A child is not something owed to one, but is a gift, the ???supreme gift of marria