You need to have a serious conversation with your child's father about this issue before it escalates. If you smell cat urine on your son, his classmates and teachers smell it too.
Let your co-parent know that he must take steps to address the cleanliness of his house. It's obvious that either he's not changing the cat litter often enough and/or his cats are peeing outside of their box.
Though it isn't your responsibility to take care of his household, it is up to you to protect your son from the inevitable consequences of his failure to do so.
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