John is married to Lisa who he shares DC with. He also shares DC with Kate (so Lisa's DSC). Lisa works part time (although not massively part time to be fair!) due to young DC so tends to take on more childcare for all of the children than John.
Whenever there is an argument between John and Lisa, one of Lisa's responses is that John do X Y or Z for his own kids from now on. For example: 'You can cook for your own kid from now on' meaning her DSC. She will say this even if DSC are there.
Lisa's DSC have told their Mum, Kate, about this who has now told John she's annoyed about this and thinks it's cruel of Lisa. DSC generally like Lisa and they get on well typically.
Lisa feels like John leaves a lot of his children's care to her and this is her retaliation when things blow up between them although it isn't always actually anything to do with the DC but this is her way of 'getting to him', by refusing to do anything for his older DC.
Who's unreasonable?
Lisa for using DSCs care as a means to punish John?
Or Kate for having a go at John about this comment?
Or options 3.. John for putting too much onto Lisa in relation to his older DC?