Sent from my HERO200 using XDA App
Wow, the way you worded that I thought there was something wrong with your dad, not his phone!
In all likelyhood, since you've already attempted to turn the phone back on, the phone is toast. For future reference if you electronic device falls into water immediately pull the battery and get the device into some dry rice. Leave it there for at least 3 days and do not be tempted to put the battery in and turn it on until then.
IT ALSO LOOKS LIKE YOUR HERO200 ALSO HAS SOME SORT OF KEYBOARD MALFUNCTION.
In the meantime, sell your jacuzzi. Buy your father a knee brace for his condition and an Evo to replace the one he Adrian Peterson'ed into the jacuzzi that has no hope of ever recovering. Problem solved.