Express the idea that family is defined by more than just DNA and shared experiences and values are important.
Well said.  Family is not defined by DNA.  It's defined by shared values and shared experience.  In fact, the idea that someone is not your family because they don't share your DNA is completely ludicrous and pretty stupid.  It pretty much negates the idea of a marriage, if you think about it.  Under the idiotic assumption you must be related by blood to be family how can a couple be a family if they don't share common DNA?