We have had a bird nest on our back patio for a few weeks. We’ve seen the mama bird up there several times very consistently ever since we noticed the nest. We can home one day and noticed TWO different birds up on the nest, and then when they flew off, the mama bird came back. But then one of the other birds came back and is sitting right next to the nest. Can someone tell me what’s happening and if there’s anything I can do to help if this bird is trying to steal her nest??