Cachet,
namaste,
I think he sent where there was the most need, where his intent is, as Firekeeper said. (Hi Firekeeper) I think it is especially lovely that he would send reiki to her, given that there must be some hurt feelings on both sides.
He sounds like a very caring person. It is almost certain that they both may miss the relationship that they once had, and are visiting one another on an astral level more than either are aware of. :o}
I have a question for you. Do you mind sharing the reiki energy with your daughter and (soon) grandchild? Did I pick up a bit of resentment in your post? Reiki energy is infinite...it is not limited by someone steping into your husband's meditation.
Take care,
Blessings,
Priestess