Don’t I have the right to be mad?

My in laws have been bugging us to let them babysit so we left our twins with my husbands parents for about an hour while we went out to eat. When we came back my mother in law has one of babies on the counter screaming her lungs out while she’s clipping her nails and my other baby is losing it as well on the ground. I grab my babies and took them downstairs to nurse and she had clipped so far that both of them had a few nails bleeding! She always bothers me wanting to clip their nails shorter and I tell her no. Since they don’t scratch themselves or anything so I just clip them once or twice a week which I think is plenty. So am feeling upset but my husband just thinks it’s stupid. So I not have the right to be upset when I told her no and she did it anyways?