Goodness! We have some serious poo issues going on here these days! Sirrahbed is posting in Cat Health about hers too. I hope it's nothing serious and sometimes it's nothing more than they have an upset tummy and it passes within a day or two. Make sure they are eating and especially drinking. If it keeps up for more than two days somebody will probably need the white coat.
You might want to try the yogurt with live bacteria and the pumpkin. It has helped others on PT. Be sure to check out the thread by Sirrahbed in Cat Health. It has all kinds of suggestions.
I'll be praying that somebody ate something they shouldn't have and this will pass quickly. I hope you feel better too!