I already understood it that way. The fundamental question always is, "How would your income have developed if you hadn’t had children?" The answer, in my opinion, is not exhausted by the conversion "part-time to full-time" because without children you very likely would never have ended up where you are today.
But of course under the premise that raising the children actually represented only the second choice for you. To put it bluntly, it would also be quite unfair to attribute and compensate an ideal career in the end to a “full-blooded mommy” who consciously and weighing all disadvantages has made this decision out of conviction.
What would be fair? I don’t think there is a generally valid formula for that. You say your ex put his money into the house and now owns assets that you were not able to build up. Based on what you described one would have to critically ask:
- Did you really pay a fair and appropriate share of the maintenance and use of a single-family house by continuing to pay half the rent of your apartment or later the 400€ income difference?
- Who paid for things that do not fall under “daily needs”? For example, who financed and maintained the stolen car, who paid for the furniture (apart from the kitchen)?
- Is it really your ex’s fault that he ultimately accumulated greater assets from his higher income (also compared to your full-time net income)?
- You didn’t want anything to do with the house during the relationship, but now you want to participate in the appreciation. Would you have wanted that as well in the case of a loss in value and possibly resulting debts?
Don’t get me wrong, I view the behavior of many (married) men in this regard very critically and I am currently experiencing this in my circle of acquaintances. A pension scheme is concealed by the man, the house is portrayed as over-indebted and the cash assets are concealed. On the other hand, I have also witnessed for many years how SHE (a trained florist) spent her life as a “wife” with TV and long telephone calls while sonny was in kindergarten 40 hours a week or later at school. At present SHE is sitting in a nice rental apartment with 2k maintenance (the child is with her 3 days a week) and telling everyone who wants to hear how badly she is being deceived.