Barbara, what he loves most in her is what he sees in her of yourself.

He will not know that for several years, but she might already.

You, though, can know it and discern it if you look back over the beginnings of their relationship. The rest takes time and restraint on your part with a good dose of "I'm here, I'm busy, and I love you both."

A way to shorten that time (to build the new unit and relationship network) is to affirm to him, often, what you like and enjoy and love, sincerely, about her and about the choice he has made.

Support them with the positivity you have always shown here. Let the worries go to a good friend (PM if you want me to be one), and trust love to work it all out in its time.

~Susan
A MIL who is very welcome on her DIL's home