It's probably because they have had to learn and live a new relationship as a second marriage couple and how hard it is to maintain a healthy relationship - you need to apply understanding, reasoning and compromisation - there is give and take - respect and submission giving an example of ideal couple and being able to help others along the way. (My Dad and mum had a beautiful relationship like that and as a child I used to wonder - people would come to our house with their problems and my parents would help them) my Dad and Mum loved them đ