Help please

I have read several threads but my problem just isn't addressed that I have seen. I bought two beautiful Red Himalayans about a year and a half ago they were great but one was way more skitish than the other. Well every thing was going ok till last December when I brought my baby home. I think they both started spraying the house. We took them straight to the Vet and had them neutered. I planned to do it sooner but had spend the last few months of my pregnancy on bed rest and didn't get to. Anyway since then we kept finding urine all over the house I at first would lock both cats in the bathroom where I kept the litter for a day and then let them out.
Well we started catching the same cat over and over again so We decided to find out why. The vet says he is healthy and I gave him another litter box in the laundry room. I also change his litter twice.
We feed the cats parina one but they refuse to eat any wet foods. I am confused as to what I am doing wrong and how to stop this. We are moving in a week and a half and if we can't figure something else out I don't see how we can keep him. Oh I forgot the cat that is peeing is also the skittish cat. He has always been less social and more standoffish even as a kitten.

I am so sorry I didn't look at the top and see all of the topics there. I have done several of the things but not all that are on there. I will start trying the citrus scent around the house. Our problem is both 1 & 2 but I figure it can only help. I will also get a bigger cat box but mine don't even seem to try to stand inside. I have learned to keep the laundry picked up but rugs are fun for him and anything the kids leave around. like Bags toys etc. I would think after 10 months he would be over the whole baby thing but maybe the move will help we are moving to a 2700 SQFt house. We have just less than half that now. and we will have 3 levels instead of one. I hope that will help.

Once there is a scent of urine, often this becomes a marked area..........moving will probably help, but.......thee are a few things you definitely want to do to assure this behavior is not repeated!
I would confine your kitties to one floor in thier/your new home at first, where you want to always keep litter box and in different room, food and water............This may be difficult depending on the layout since you also want to keep them happy so they don't retaliate the move by starting the same behavior again. Even if it is only a day or 2, or up to one week, when they seem comfortable and not repeating that behavior, open up another floor, possibly both. Each floor you want to keep a litter box on at first, but with 2 cats you derfinitely want 2 litter boxes atleast anyway. If you can't confine them to one floor at first, make sure you have litter on each floor and show them where each one is. If it happens still, you have a troubled kitty on your hands.....goodluck!