You can get food poisoning from anything. Expired milk, chicken, etc. Unless we know what all the family ate the whole day we are just speculating.
Example - I got food poisoning from eating fried mixture from a bakery. First time i ate very little, i felt something queasy in my stomach. Then at tea time when I ate on empty stomach, I felt the full effect. Started vomiting at night and had loose motions every hour or so. I probably vomited 4-5 times till my stomach did not have anything left in it and was just vomiting air out. Out of half kilo i had bought, i had barely eaten 50gms of it. Even my intestines had become empty completely due to loose motions. . Took me ~4 days to recover completely from that mess. Another time I had food poisoning at office where 6-8 guys who ordered fried rice and chicken curry from a restaurant had to go to the loo all at once. People were complaining because there was only one loo and it was always busy.
Example - I got food poisoning from eating fried mixture from a bakery. First time i ate very little, i felt something queasy in my stomach. Then at tea time when I ate on empty stomach, I felt the full effect. Started vomiting at night and had loose motions every hour or so. I probably vomited 4-5 times till my stomach did not have anything left in it and was just vomiting air out. Out of half kilo i had bought, i had barely eaten 50gms of it. Even my intestines had become empty completely due to loose motions. . Took me ~4 days to recover completely from that mess. Another time I had food poisoning at office where 6-8 guys who ordered fried rice and chicken curry from a restaurant had to go to the loo all at once. People were complaining because there was only one loo and it was always busy.