Is it because of Feng Shui that families always quarrel?

Feng shui is a reward, not a positive one. There are always quarrels at home, which may be due to Feng Shui, but the root cause is family. If everyone in the family plays their role well and forms an inclusive, friendly and obedient atmosphere, even living in a place with extremely poor feng shui will turn this place into a blessed land. You can refer to Fan Zhongyan's example.