Is it possible to have a relationship with no fighting?

My grandpa died before I was born but my dad said he only saw them argue once during their 30 year marriage. The argument was when an earthquake happened and some people lost their homes and needed a place to live, and asked my grandma for help because our family had more money and more property and my my grandpa did not want strangers in our home but my grandma did not want the men to die if they had no place to go. That was the only argument they had in their entire 30 year marriage. But my parents fight 90 times a day.

Is it possible to have a relationship with no fighting?
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