Ex husband is self-employed. He works as a carer and runs a shop with his partner. I don't know his income. We have 2 kids (14 & 17). The 14yo stays at his 1 night a week (picked up at 8.30pm home at 5pm next day). 17 yo hasn't been to see him other than boxing day in the last 9 months and has autism that affects his day to day life. They may start seeing him one day a month, but this is reliant on exs parents taking them. Ex pays £200 per month. We do not get on well. Our arrangement is between us and has been the same for the past 5 years. No CMS involvement.
Can anyone help me with how to approach asking him to increase the maintenance as it is getting more and more of a struggle to keep up with costs? I did ask if he could increase it at all about a year ago and was just told no. At the time I didn't go through CMS as from what i understood with him being self employed makes it far trickier to estimate a figure, and I really can't afford to get less than the £200 I do at the moment.