Sadly your parents need to come to a decision themselves on lifestyle changes, you'd think the health scares would have been enough. The elliptical is a great idea but will they use it? Maybe a heart to heart with them as to how you feel about them and their well being.
Fitday start date 12/9/12
Fitday start weight 190
Highest weight Jan 2009 218
Lowest weight Aug 2009 175
Goal 160: ACHIEVED Aug 25/13 (now to figure out how to stay here)
If you do what you’ve always done, you’ll get what you’ve always gotten. –Tony Robbins