The best, most wonderful book on the subject I ever read was "The Open Adoption Experience."
It calmed my fears, opened my eyes, and has made me a completely different person.
It cites study after study and reason after reason for OA.
I gave a copy to my parents.
(Man, do you have to be patient with "outsiders!")
You are very sweet to be so kind as to explain over and over again to your parents.
They are from a different generation - I had to keep reminding myself of that - and they don't understand it. The concept is so foreign. So calmly, before an argument started or the subject even arose that day, I said, "I would like to talk to y'all about OA and what it means."
They were very receptive, I cited studies, and by God, I think they finally "got it."
The subject was never really mentioned again. They talk to me about my daughter's birth family, and not in a weird way. They know we have a relationship, and they know why.
I have thought about embryo adoption in the future (okay, I've thought about every sort of adoption in the future) but I would want it to be, if at all possible, an OA. (They do exist in EA, even though EA is not technically "adoption".)