From "The Open Window" by Saki, H. M. Munro, write a brief character sketch of Mr. Nuttle and Mrs. Sappleton.

What we know about Mr. Framton Nuttel in "The Open Window"
by Saki (H. M. Munro) is that he has no social graces, which is to say he doesn't quite
know how to conduct himself in social situations, like that of paying a visit to total
strangers: "Framton Nuttel endeavored to say the correct something." We also know that
he makes a habit of staying by himself and not mixing with other people, as his sister
says to him: “you will bury yourself down there and not speak to a living soul.” We know
he has some sort of nervous complaint for which he is taking a "nerve cure" that entails
"complete rest, an absence of mental excitement, and avoidance of anything in the nature
of violent physical exercise." And we know that Framton is doubtful of the added benefit
to his nerve cure that might be derived from meeting complete strangers to whom his
sister has written "letters of introduction."

We also know
that his limited idea of conversation, which “labored under [a] tolerably widespread
delusion,” includes "only talk about his illnesses." We also know that Framton is
impressionable and naive and gullible. We know all this for two reason: the way he
describes the young niece, Vera, and the insight of hindsight we get at the close of the
short story. The narrator often reflects Framton's own observations such as when
describing the niece as "a very self-possessed young lady of fifteen"; as when later the
narrator adds, "pursued the self-possessed young lady"; and later still says: "The child
was staring out through the open window with a dazed horror in her eyes." The insight of
hindsight that informs us of Framton's impressionable gullibility comes when Vera starts
to make up an appalling story to explain Framton's behavior--just as she did to fill in
the void of Mrs. Sappleton's absence (notice how Sappleton is reminiscent of “sap,”
which means “a gullible or foolish person” (World English
Dictionary)).

Speaking of whom, what we know of Mrs.
Sappleton is that she is bright, cheerful, and energetic: "the aunt bustled into the
room." We also know that she is very enthusiastic in her praise of the activities of the
men she cares about, her husband and brothers (and their little spaniel dog). We also
know she is big-hearted and gracious when bored by tedious visitors (like Framton
Nuttel) but not at all unrealistic in her assessment of
strangers:

A
most extraordinary man, a Mr. Nuttel, ... dashed off without a word of goodby or
apology.... One would think he had seen a
ghost.

We also know that she
is good natured and a doting wife and loving sister, even when teased: "I said, Bertie,
why do you bound?" Finally, we know that Mrs. Sappleton doesn't understand Vera in the
least. She never suspects for a moment in the story that Vera is wreaking havoc with
people's imaginations through wild stories she convincingly concocts in an instant, like
the one about the men being lost in a quicksand bog and the one about "’a cemetery
somewhere on the banks of the Ganges [with] a pack of pariah dogs.’ … Romance
[adventure] at short notice was her speciality."