Do they use their litterboxes for peeing at all? If you can tell me that, I have a good idea of what your solution might be.
1) Use the boxes for peeing: If they then still decide to pee on your stuff, its because they are feeling insecure and stressed. If this is the case, there isn’t much you can do, except to give them lots of reassurence that you love them, and that they are safe in their environment. This is not going to get them to stop peeing all over your stuff, so i would suggest you limit them to one room in your house where they can stay untill they have calmed down, and then you can gradually start re-introducing them to each of the other rooms in your house, one at a time.
2)If they dont pee in their boxes: they probably dont know that that is the appropriate place to pee. You can do this in the case of no 1 as well, but all you have to do then is to dry up some pee from the freshest place they peed with some paper towels, and then leave the paper towel in the litterbox, and then take your kitty, in a very calm and kind manner, and show her that her scent is now in the box;and that’s where you want her to pee. You could even give her a treat then to reinforce the message. Keep on drying their pee with the towels and leaving it in the boxes, they’ll get the picture very soon.
Urine is a way for cats to mark the areas where they feel safe, so your bed and you, and your clothes, signify things to them where they feel safe. They will keep on going to the places (to pee) where they’ve peed already, because their scent is there, and that means to them thats its a safe place to be. So if you keep on ‘transferring’ their scent back to the litterboxes with the papertowels, it should signify to them that this is where mommy wants you to do your business. Leave the towels there so that their scent stays there. You must also make sure that the boxes are in quiet places where they wont be disturbed. You might even consider leaving a box next to your bed and couch, it would make the transition easier for the cats because its already a ‘safe’ area for them. Also, please continue with the feliway, it should help them stay calm. Good luck and let us know how it goes!