If a family member in my household has the coronavirus does that mean I have it?

Not necessarily but I would go and get tested just in case 

Probably. You should self-quarantine

No, but you probably will get it if you have been within 6-8 feet of him when he got and didn't have any symptoms. You should isolate to your room and not come out for 14 days to keep from giving it to someone else in your family.
Who do you want to sacrifice?

No, but you will possibly get it.

Fine for a divorce.

No it doesn't mean you necessarily have it, and if you do, it doesn't necessarily mean you'll get sick from it..

Probably 50/50 chance.

no but self quarentine

no but get tested

Not at all silly.  You will develop an immunity to it and be healthier more than ever before.