Hello, Thanks for the query.
You are four member and that too weekend.
All are ill and having vomiting
and stomach cramps ( excruciating pain).
So note one point that all you have took same food and the culprit is in the food i.e. food poisoning
In food poisoning there is severe pain
in abdomen ( stomach and intestine), vomiting, mild degree shivers and tremors ( mild).
Due to intolerance of these child feels more pain that too for second day ( pain threshold of different persons are different).
Use bacteria free water and food .
Good luck for the whole family. Dr, HET