Can I be angry at my mother-in-law in front of my children?
Why are you mad at your mother-in-law?
She refuses to let my brother-in-law switch jobs.
There's nothing wrong with being frustrated with a family member, but yelling at your mother-in-law in front of your children is not a good idea. Doing that can scare your children and traumatize them. If you are going to confront her, do it in private away from your children so they won't hear or see.
Fuck this. It's just a dumb in-law. Why would I care about her?
It is expected that we deal with conflicts with adults away from children and other family as they do not deserve that stress.