thanks for consulting us,
your symptoms suggest you are suffering from acute diarrhea
you have not mentioned if there is blood or mucus present in the stool, which would have helped in the diagnosis of dysentery
you need to visit a doctor as soon as possible and get stool examination done for all the 3 of you.
the stool examination will only reveal if it is shigella
or any other bacteria or parasite causing the symptom.
in the mean while have plenty of water and have home made light , non spicy, non oily food.
and let your doctor prescribe you all some antibiotic.
take care and keep your self hydrated.