Hmmm...that can be a problem. Until I was about 2 and my brother was 5 I think, my mother had an Olds Cutlass Supreme coupe. She didn't seem to mind having a coupe, but she decided it would be more practical to have a family car. The thing I remember my parents doing to help prevent spills and messes is they used bath towels to cover the seats. Perhaps that could help. About the child seat thing, I don't know what to tell you there. I guess get a used family sedan that you could use to transport your kids.