First, I think he should get a urinalysis done. I know that she doesnt want to take him, BUT it really could help.
Also, he might be stressing out, so you could try feliway spray.
IF that does not work, see about putting him on something like prozac or amitriptolyn. Prozac really helps cats with peeing/behavioral problems.
Either way, she would need to vet him to get him meds and such.
Only thing not vet related she could try is new litter, and new/more boxes in the areas he goes most. and the feliway.
GOOD LUCK!
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