When my parents broke up I went from not understanding about domestic finances to feeling the loss of being the "poorest" kid in the bunch when we went out. My mother worked 2 jobs, sometimes 3 and dragged me to 2 schools as well as leave me with family when she worked in the evening or have me for 2 hours in the waiting room while she finished work. It was then a night bus home in the cold and rain and then supper and bed.
The next day more and so on for a longtime. When I was able to I worked part time and contributed a portion to the home. There was a lot more sh1t to deal with when you have to stretch the income to make ends meet but that is my secret.
I understand that her leaving will affect your income and will change your lives but your lives will never be the same again anyway. In all of this the only images and flashbacks I have of their break up was the loneliness of not having a father, the fights and discussions I had to endure. The tense moments as well as being dragged into some of the battles.
My mind does not remember the financial hardship when it was my mum and me first but the emotional pain when they were together.
I have a friend who also packed all her stuff into a car and left leaving everything behind, just her and her 2 children for a new start. 2 years on and they are miles happier. Financially poorer but emotionally richer.
Sometimes the worst brings out the best in us. Children are stronger than you give them credit for, don't overprotect them. The bigger the bubble the bigger the bang.