What is the secret? Will there ever be arguments or differences? As Christians we must be clear that our happiness comes from Christ, our Lord. And that must be passed on to the family.
Always show contentment and gratitude in the face of any difficulty, because there will always be someone who will be having a more difficult time than us. To avoid strong arguments between family members, the main thing is that everyone must work on character.
There will always be something about us that we have to change or work on, and this is the main thing for peace to reign at home. If some have explosive characters, others are passive, some can be very sentimental, and even another reminiscent.
We must work on these defects, to avoid fights and differences. Within your church you could look for a mentor to help you with this work, which is not easy, but it is not impossible either.