Reflect back the qualities required and job priorities as being the things you do best and enjoy. Say why you think the company is good, and that you want to work for an organisation like it.

Prepare a number of relevant examples. Make sure you feature as the instigator, or the factor that made the difference. Examples must lead to significant organisational benefits; making money, saving money/time, improving quality, anticipating or creatively solving problems, winning/keeping customers, improving efficiency.

Identify the two or three main issues and say how you'll deal with them, which shows you can focus on what's important. Emphasise your personal strengths that are very relevant to the role requirements.

Another opportunity to state relevant strengths, skills and behaviours.

Tell the truth. You are you. Your parents are different people. Your parents have no bearing on how your value should be judged. Avoid reacting in a defensive, judgemental, ashamed or critical way. 

Avoid anything deeply personal or seriously emotional unless you are in complete control of your feelings about it. Try to prepare an example that's work-related and relevant to the role.