Their eyes rested on a nude woman suckling a baby, while a girl was kneeling by their side holding out a flower to the indifferent child. Looking over them was a wrinkled, scraggy hag. It was Strickland's version of the Holy Family. I suspected that for the figures had sat his household above Taravao, and the woman and the baby were Ata and his first son. I asked myself if Mrs. Strickland had any inkling of the facts.

这里 for the figures had sat his household 没看懂，这里句法成分怎么分析呢？这里的for是关于吗？sat不及物动词为什么会有宾语his household呢？