Need help now- male cat spraying question?

Sometimes it still can happen after they're neutered if it was done after a year old. But, for the most part, he will only do it when he feels threatened. The smells might make him a little cautious or even anxious, but unless he smells the cat directly or it's old urine, he probably won't react much. You could use a vinegar water solution and spray it around the house like air freshener. It neutralizes the air and gets rid of cat pee (and assuming other cat smells). Good luck. Tell them they need to keep the kitty!!!

i thin it will be ok... most of the times they spray when they feel in risk and even if the house smells like cat there is not cat to make him feel at risk.. so no worries tell your parents to go for it :)

He shouldn't be doing this at all if he is neutered. Usually it lessens the cat's desire to do this. They have resources I've linked to below.

he needs to be neutered.