Tropes about children of children and so on and so fourth.
What you get when you add The Parent Trope to it's offspring, Son of Trope, Daughter of Index. Especially applies when you add the parent's parent or the offspring's offspring. Also applies to any ancestor/descendant connection. Extended Family Tropes count too since they are related through the generations. Anyone who fits the age of about 20 years or so apart counts too. If they are in an immediate family and the same generation they belong in Sibling Tropes.