I agree with Andrey Skorobogatov , Amal Saadoon Majeed, J. M. Koli , Ilhami Unluoglu, Hein Retter and Shakir Tuleab.That the most important things to keep the family happy are love,respect ,trust and tolerance.
If such secrets existed and every member of the family struggled to follow the proposed formulas for achieving happy coexistence - this would not be a family but a branch of psychiatric hospital.
There are many countries today in which the upbringing of the young generation and everyday family life is marked by political instability, the bending of justice and violence. If you are lucky enough to live in a country where you feel safe, then this is a great gain for a happy family life.
I think that for a family to be happy, it is essential that it be based on the love of a couple who also wants to share a similar family life project. From this premise, it is possible that first parents and then parents and children create a space in which everyone feels protected, supported, understood, respected, loved ... in short, a happy home.
I think that love and faith are a secret for those parents and their family members when love and fidelity remain unknown to them in their value, so that in family life not love dominates but alienation. I maintain that love and faith are not a mystery in happy family life, but are well-known. This is also felt by all those who know this family.