Hi and welcome to PT. I'm sorry to hear that you're having problems with your cats. I have two female cats and 4 male cats and my two females are much more territorial than my males. Cats hate change and I've also noticed that it bothers my females much more than my males. My females still hiss and growl at my two kittens and I've had them for a little over 2 months now. Since you and your husband are home more often, they may not like this change as much as think they would. My cats love it when I'm home but they also fight more for attention from me. When I'm not home, they'll sleep more and will probably have less fights with each other.

Here's a great website that tells everything you need to know about litter box problems and how to solve them:http://www.catinfo.org/?link=litterbox. I had a peeing problem a few years ago and my vet recommended Cat Attract which you can buy at Petsmart or online. It worked for me right away. I also had to put out more litter boxes and put them in different locations. Good luck.