If your husband can fix it with a plunger, then, and this is coming from
the plumbing newsgroup, there's probably something caught in the toilets
themselves. When you plunge the toilet, the toilet paper gets forced
through, but that which is catching the paper is still there. Either try a
closet auger, or take the toilet up, turn it upside down, and do your best
to find and retrive the obstruction. It could be a toothbrush, or toilet
paper core, or shampoo cap, Q-Tips, or some similar item.
If you don't find an object in the toilet itself, then it's further down