The thought of his mother gave him a pang.

He did not stay very long, for the thought of his mother was heavy on him.

In the next paragraph, thoughts of his mother and the fish occur side by side, too.

The thought of his grieving mother almost made Trip wince.

Caroline looked at him; and thought of his mother, Denise.

With an effort, Maggie put thoughts of her mother aside.

The thought of his mother on the battle bridge was more painful than the bruises.

The thought of your mother recalled me to my duty.

Irravel thought of her mother dying on the other ship, the one they were chasing.

Then one morning the thoughts of our mother took shape again; but they were fragments.