The Intergenerational Ties Bind a Family in Ways Other Relationships

The intergenerational ties bind a family in ways other relationships do not. Which of the following is an example of those ties?

A) Sue and Tom divorced, but remain friends.
B) Fred changed jobs and now works across town. Fred and his former coworkers still have happy hour once a month.
C) Kristy and Claire grew up next door to each other and had a sisterly bond. Even though Claire moved away in high school, they were in each other's weddings.
D) Timmy's parents are divorced and he lives with his mom. However, Timmy still spends Christmas with both sets of grandparents.