I think Jodi's just pissed that J&K have become independent and don't need her help anymore. I think I'd be mad that they got a nanny if I were Jodi, but I mean, they can't rely on their family forever.
Yes it's possible if your genitalia even touch an infected person can pass along the disease, so if you dry humped or if you got head from a girl who had genital herpes in her mouth then you can get it too.
It could just be an allergic reaction to detergent or something you ate...