It seems unexpectedly this site became active again after a spring hiatus. Late nesters?
perhaps the first nesting attempt failed or was disrupted? It seems quite likely that something is going on here.
from the owners:
We had a small red owl come back about 2 weeks ago. The next day there was a much larger owl sitting next to it in the house. Couple hours later both were not visible, could have been down in the house. Since then the little red appears from time to time but the large owl has not been visible
So it would seem the gray phase (larger owl) is the female, she popped her head out at dusk this evening so I could get a pic.