Coronavirus Antibodies

May 8, 2020
Hi there,

4 people in my family including myself (we all live in the same household) went to get the antibody testing a couple of days ago because we were exposed to someone that tested positive to the coronavirus. We just got the following results:

Myself: Positive (I guess I am asymptomatic since I don't remember being sick)
My wife: Negative
My mom: Negative
My son: Negative

If someone can please answer the following questions:

1) How is it possible that I was the only one that got the virus? and when?
2) When does my system form the antibodies after having the coronavirus?
3) Can you test negative to the antibodies because you still have the coronavirus?

I would appreciate it if someone would answer my questions.