How do you maintain a sense of unity in a family that has been built through so many different stages of your life?

Should you feel upset when your dad didn’t do a slow dance with his daughter at his son’s wedding but did a dance with the bride instead? Is it a tradition in the UK or USA to do this?
Why do some people refuse to engage even when you try to communicate in their language or culture, and what can you do about it?
Do you think the modern habit of constantly talking about feelings has actually made relationships stronger?