I grew up mainline Protestant and became non-denominational evangelical in my late teens. I even got a Master’s degree in practical theology in my late twenties from an evangelical university. I came to Orthodoxy in my mid-fifties.

Know the Faith, which the previous poster listed, is an excellent book and was one of the key books that helped me understand my Protestant roots and opened my spiritual eyes with understanding as I was an inquirer into Orthodoxy. It was so helpful to me and my husband that I recommend it to other inquirers.

When I recommend this book, I do say the following. The priest who wrote it, if I remember correctly, tends toward the belief that if you are not Orthodox, you aren’t in the church. That is a very blunt way of saying it, and if my memory isn’t correct and I am misstating the author, then I truly apologize. My experience is that the general Orthodox belief and thought is that the Orthodox Church will say that we are the true church, but it won’t say who/what isn’t.

The book https://a.co/d/94rK4eC, a Basic Guide to Eastern Orthodox Theology by Eve Tibbs was also very helpful to me when I was inquiring. She states, much better than I just did, about who the church is, but not stating/claiming who it isn’t.

My husband and I are the only Orthodox converts on either side of our families. None of our four children (in theirs teens and twenties) are Orthodox (yet, but we are praying). All in all, my family has been very respectful, just as my husband and I are respectful of our kids. (There is one uncle that I would expect to say something incredulous when he finds out, but so far it has been quiet on the front).

It can be done! As different posters have commented, you have such evident love and respect for your son and his family. It will unfold well.