I feel for your boys as they struggle with the living arrangements. Good answer about the cars, and they shouldn't feel like they have sneak toys back.
If they don't have a photo of you at your W's place, get a picture or take one now if you with the boys that you can frame and they can put in their other room. It helps at bedtime to have a nice memory & smiling face to ease the sadness. Actually, the reverse is true too.. a photo of them with their mom at your place would be helpful as well.
