I am a Marine myself and between extensive combat experience, close quarter, and hand to hand, I am well versed in a variety of disciplines. For me this comes naturally.

Now that being said, I am having a hard time figuring out what to teach my wife and daughter. What is overkill versus necessary to defend effectively without going overboard? 

My wife is 5'4" and weighs 100 lbs soaking wet and my daughter is 5'7" and 100 lbs soaking wet. So I am looking for suggestions as to how to approach their training without inevitably treating them like Marines and turning them off because I am "too rough" or "too demanding" or "expecting too much"? I want them to have the best but I know it may not be a reasonable expectation, so I am content to having them learn what provides them the most comprehensive and yet relatively easy to learn while effective techniques.