It's illegal.Second piece of advice - don't talk about your dad like this on a public forum and don't reveal sensitive issues of a very private nature on a publicly read forum like this that can hurt your dad.

At the same time, I believe the topic of investing can be a sensitive topic to many people because it brings up the discussion of money.

I always am sensitive to all parties involved, and explain clearly to my client that you don't break a deal over a house you love because of the things I find.

I then worked on crafting a message (it took a few tries to get it right, need to be really sensitive). 

Today I asked an agent (for an apartment complex) and he did not know and said he would not ask for fear of putting the seller off.This raises alarms for me- am I being too sensitive?

Careful OP, there are some sensitive mods on here that don't take kindly to you smashing their BRRRR marketing.This is the thing I hate most about Biggerpockets.

Some people are very sensitive to smoke/second hand smoke and will select a building that specifically is non-smoking.