I have no issue with snowboarding personally. It looks like a blast and I hope to learn it someday.
But I've never seen quite so many domestic arguments on the slope as I have over snowboarding.
The basic gist is unless you're a professional instructor/teacher: Don't try to teach a loved one snowboarding.
The usual scenario is guy wants to go snowboarding and talks his girlfriend into coming along. "It's easy I'll teach you." After about the 15th fall said girlfriend is more than a little miffed, dude just wants to go do some runs unencumbered, and there usually is a screaming argument.
That's the usual scenario, but I recently saw a father yelling at his young son over the same exact scenario, which I found particularly appalling.
This was at Sugarbowl who has a great instruction program for beginners of all ages. There really isn't an excuse for this.
When you learn to be a teacher, you learn to have some distance (I speak from experience). If someone you're teaching suddenly decides they hate what you're teaching, that has to be ok. It's part of learning to be a teacher. That distance is even harder to maintain when you are trying to teach someone you care about. You can do it, but it takes effort and that's even if you already are familiar with the professional distance that a teacher or instructor has. If you are tied up in the outcome then OMG you have already lost, and odds for a domestic meltdown are very good.
Do you and your family a favor and sign up your loved one up for lessons. If you want to be involved, take the same class.