What’s the title of the story or the chapter?
Of pure or unmixed breed, stock, or lineage, as a horse or other animal; bred<span> from the purest and best blood. hope this helps</span>
In the first sentence, the "he" is a nominative as it is a subject.
In the second sentence it is an object as the form "me" is actually "I", but "i" is a nominative form and "me" is an objective form.
In the third sentence "Us" is also used in objective form as "us" is an object of an action by "my sister".