Feng Shui's parents suddenly quarreled all the time.

There is a difference between elders and elders. The quarrel between elders can't be solved by changing Feng Shui. There are many reasons, often not what it seems. You might as well think in another direction. Quarrel may be a way for them to express their feelings. Your mood is understandable, but if you take care of it too much, it will be a burden to them, which may be counterproductive! Talk to them when they are happy.