Bluebird question

[Debra Powers]

For the past two years we have had blue birds nesting in our nesting boxes. They have been successful with one clutch each year. This year it is the strangest thing to me, I have two males and a female that are supporting the box. The two males go in and feed as well as the female, or defend the area. I have watched Blue Jays come in and one male will go after the Bluejay while the other one comes in and sits by the box. Is this normal behavior to have two males could this be last year‘s clutch?
Thanks,
Deb Powers-SouthBerwick

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