Barn Swallows I’m guessing? Back where I come from the the old saying (based on actual observations) was that wherever the swallow chose to build it’s nest would not be taken by a Tornado!
There’s a old barn up on the hill behind where I live now. Swallows there. I look forward to them every year. When I’m out mowing, they come on their bombing runs catching bugs of all kinds, getting very close. They are nice birds.
BUT > I understand your frustration. After the young have fledged, you should be good to take down their mud nests and close off the area they chose to build, which will discourage them from rebuilding next year. The young could be right on the verge of leaving the nests very soon, depending on where you live….
Hang in there