I am a parent to twins and step parent to 2 girls ages 10 and 8, my partner and I live together and have all 4 kids about 95% of the time. The exes step in once a fortnight for the Saturday (iif they feel up to it).
My ex pays child maintenance which barely scratches the surface but I appreciate its more than some parents get so that's not my beef. My beef is that my partners ex gf doesn't pay a penny towards the girls upbringing, not anything at all. So every single expense is on us. My ex refuses to go at her for child support as he's petrified of rocking the boat and her kicking off. His reasoning is that we can afford it so why get worked up about it. We can afford it but periods of the year like back to school, we have to watch the pursestrings and for me, it's more about the principle. She's having baby number 7 at some point this month, yet doesn't pay towards her 4 older kids? (2 youngest live with her). God I get so wound up about it and I know I need to try let it go so please, any advice on how to do this would be hugely appreciated! My mental health is declining.