Unless his daughter is hanging out among black rappers who are dropping the N word then this isn't particularly relevant.
No kidding. There are plenty of other words you can tell a 4-year-old not to say, with no further explanation beyond "because I said so." I certainly wouldn't go down the road of trying to explain race relations to a preschooler.
Funny you should bring that up. The other day I told her not to do something and played the "because I said so card." Is this genetic? This is one of those things I vowed never to say.
Nah, you just have to have a feel for what is really age appropriate for your child to understand. I don't think a 4-year-old is going to "get" why some words are okay to say and some words aren't, much less understand the nuances of what words you can say around certain people, or why some people can use words that you aren't allowed to, etc.
I think I was about 9 or 10 when I first encountered the "n-word." I had just moved to a new school, and at recess, one boy used the word to refer to a black classmate. "What did you call me?" she asked, clearly looking agitated, but I didn't know why. So I, um, repeated it for him.
That was a mistake I only made once.
