Actually, the WTS discourages JWs from adopting out their children or grandchildren since minor children are considered subject to the fate of their parents. That is if the adoptive parents are not JWs, they will die at Armageddon if they remain so, and their minor children as well. So the grandmother and other JW relatives are at fault to begin with if the child(ren) suffer eternal destruction whether the adoptive parents are gay or straight.
This policy is why unwed JW mothers are encouraged to keep their babies, not give them up for adoption. This was in 1956 but holds true today.
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w56 8/15 p. 511 Questions from Readers? If an unmarried pregnant woman who has made arrangements for the baby to be adopted comes to a knowledge of the truth before the baby is born, should she then feel obligated to keep the child in order to teach it the truth of God?s Word?
One may argue that if the baby is adopted it will have more in a material way and will not have to bear the stigma of illegitimacy. But spiritual provisions are more vital than material things, and if necessary the social stigma can be avoided by the mother?s moving to another place.
Jehovah commands the parent: "These words that I am commanding you today must prove to be on your heart, and you must inculcate them in your son and speak of them when you sit in your house and when you walk on the road and when you lie down and when you get up." How could a parent do this if she gives her baby away? How could she give it the right start in life: "Train up a child in the way he should go: and when he is old, he will not depart from it"??Deut. 6:6, 7, NW; Prov. 22:6.
At the moment it might seem wise to unburden oneself of the problem by having the baby adopted, but it would be against the motherly instincts and as time passed there might be bitter regret because of this course. It would be against natural affection, although in these last days of critical, difficult times we are told that many persons would be "having no natural affection." It would seem better to follow the principles of motherly affection and love for offspring and the keeping of a clear conscience. Even the principles of Christian faith would seem to be violated by failure to look after the child one brought into existence. Paul wrote: "Certainly if anyone does not provide for those who are his own, and especially for those who are members of his household, he has disowned the faith and is worse than a person without faith."?2 Tim. 3:3; 1 Tim. 5:8, NW.
So it would seem more courageous and more Christian to bear the burden of keeping and rearing the baby, facing whatever consequences that might follow, such as loss of reputation. Especially so now that the mother has come to a knowledge of the truth and is in position to teach the truth to her offspring and perhaps make it possible for it to live forever in a new world of righteousness. The person finding herself in this difficult position must make her own decision as to the course she will follow.