They arrived at a farmhouse in front of which sat

问题补充：

They arrived at a farmhouse,in front of which sat a small boy.

答案：

他们到达了一家前面坐着个小男孩的农舍.

======以下答案可供参考======

供参考答案1:

他们来到一个农家，在那个坐着的小男孩对面