According to your sign and symptom your family member are suffering from some inflammation with infection as Vomiting and stomach upset .
As you know that best treatment depend on the correct diagnosis and correct diagnosis depend on the complete history of the patient so please take consultation from a doctor and give complete history of the patient so that correct diagnosis will be make and then best treatment will be start.
Next Steps
you should do some test as CBC and ESR and
Lipid profile and USG of whole abdomen and
LFT to know the exact cause of that sign and symptom.
Health Tips
Your family member should follow good life style