I've just received my recalculation of CMS for this year which has been reduced due to my ex apparently paying maintenance through a 'family based arrangement' I.e. without cms involvement for another child however the only other child he has is with his partner who he currently (and always has done since said child was born) lives with.
Am I correct in thinking that maintenance is only paid when 2 parents are no longer together and therefore for him to claim he is paying maintenance for his other child isn't correct in terms of CMS calculation terms?