Scott - In fairness to yourself a large number of children have somewhat turbulent upbringings due to divorce and sadly in your case the death of your mother. The case by the sound of it is that you delt with it - you never get over it and nor should you.
Any interview should be an exploration of your character and potential ability - I wouldn't worry about your family background affecting it.
As for your activities - all of it puts a positive light on you - by all means let the interviewer know about your interests but it might be the case that he or she asks specifics or asks you to give a picture of your activities . Depends on the interviewer -
I don't think you have much to worry about - be yourself.