Do you know something about owls?

There is this owl family that I have been watching. It puzzles me. Sure I live in the land of the midnight sun however they are only active during the day. Albeit more so in the evening then during the afternoon heat.

I’ve stayed up all night. I never hear or see them. But all day long they will be flying from telephone pole to trees hooting quite loudly.

Also there seem to be two males and one female. At least they are smaller then the biggest but the same size as each other. Is that typical?