Eustace and Jill Wyvern

Eustace is sibling of Jill Wyvern chapter 3
Eustace is cool towards Jill Wyvern chapter 3

They deal with each other in Ring for Jeeves 3.

Every dealing, in order

Chapter 3Eustace is brother of Jill Wyvern
Chapter 3Eustace is high hat with Jill Wyvern