The cement grave cracked a small house covered with cement, and the right part behind the house cracked a hole about 20 cm. I wonder if there is any water leakage.

Under normal circumstances, the coffin will rot after being buried in the soil for about 6 years, and the coffin will fall apart under the action of soil pressure, which will lead to the collapse of the grave, the foundation of the small house and the uneven settlement of the house. This is normal. As for whether it can be repaired, it is estimated that you have considered the problem of yin and yang rooms. In fact, if you believe it, you will have it. If you don't believe me, then look at the old calendar and choose a suitable day to repair the grave. Or find a teacher of yin and yang and choose an auspicious day.