Well, if you want to avoid the parent thing, I can't see anything but a doctor for you. Just keep bringing him to all the plants I guess. It'll have to take a lot of work on your part.

Otherwise, if you have a woman over 50, you could try parenting him with her. She won't get pregnant, and you can just keep putting them together with each other. However, you run the risk of him taking off with other girls when you're away.