Yes it is. We can offer opinions and advice until the cows come home. But ultimately it's up to the chicken keeper to decide what's best for their flock. As long as it doesn't cause pain or suffering for the chickens, of course. Cruelty is never an acceptable option.
So they belong to both of you? That does make it a little harder. Personally, I like hearing my roosters crow, but I realize not everyone enjoys the same things in life. It's so common that it's become more background noise than anything. (But DH and I raised 3 sons so I learned to tune out a...
My question is, who's chickens are they - yours or your mom's? If they're hers and it's her property (who has the title and who pays the taxes?), it's not your place to tell her what to do. Deal with it. If it's your chickens on your property, do the poor guy a favor and either find him a new...