My dad is the true Gemini with the different personalities. He is the understanding man with the only expectation he asks is being respected. Whatever conflict of opinion and how passionate he is for it, be respectful.
As being respected, he does not like to be wrong and if he feels threatened he will go for the jugular. He is an old school Italian brought up with even more traditional values with seeing things as black and white.
As the time came and grandchildren came along, the man came to the realization that what he did with his older children and how they ran away, his grandchildren have the opposite relationship.
He is an old man who has come to grips of the things he make mistakes on in relationships but is not to proud to fix the errors of his past and not have a relationship with his grandchildren.