Just why was he a simp, for instance?
Was it because he thought Foster owned the car?
Bud wondered whether father-in-law had not bought it, after all.

Now that he began thinking from a different angle, he remembered that father-in-law had behaved very much like the proud possessor of a new car.

It really did not look plausible that he would come out in the drizzle to see if Foster's car was safely locked in for the night.

There had been, too, a fussy fastidiousness in the way the robe had been folded and hung over the rail.

No man would do that for some other man's property, unless he was paid for it.
Wherefore, Bud finally concluded that Foster was not above helping himself to family property.