I'd support him and love him no matter what. A person's gender is just one of the many facets that comprise his character and personality, like their skin color and interests. Parents should focus on raising happy, healthy, responsible, and accepting human beings. A person's sexual identity isn't and should never be their defining trait.
Hi there, I asked my partner about this and he doesn't mind. He'd love and respect the child all the same and honestly, so will I. It's hard growing up in today's society and whatever happens, come what may, we would love and protect the children in all cases.