Anger seems to be a common struggle among moms. There will always be triggers that make us angry, it's what we do with our anger that matters.
I think we often forget we are parenting children, not adults and raising people who are born into sin and prone to it, just like we are. This is all the more reason for us to parent our children with grace.
Parenting with grace does not mean our children get away with everything. Parenting with grace is simply how we approach conflict with our children. Discipline and correction are still given, but it is in the manner they are given which constitutes grace (or lack thereof).
What we need is a perspective shift.