if you dont feed them or take care of them or avoid them for a while and if you dont know how to take care of them then you can get a doctor and there is other answers for getting a lot of money if you cant afford it
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If a member of the family is a bit sick, cure them. If they are still sick with another illness, do not cure them. Get a doctor consultation. The doctor will tell you to use Vancomycin and you will get the gravely ill trophy.
Leave them alone for a LONG time!! Then they starve and/or everyone gets sick. Like I say four days, or you can change the time on your device.
I'm sure that there is other ways, but you could either starve them to the point when they don't feel good, or you could keep them awake for a long time without letting them sleep.
They become sick on their own they cannot be made sick however of you don't take care of them that much they will become sick