Summary: Derek is married to Meredith. Mark is married to Addison. Addison and Derek never got married or even dated for that matter. Derek, Mark, and Addison all went to med school together. Derek later on met Meredith and married her.

Derek and Meredith live in Seattle

Mark and Addison live in New York with their two-year old son, Noah Alexander.

Derek has four sisters

Kathleen Gordon, married to Will Gordon.

Kathleen and Will are both psychiatrists.

Kathleen is the oldest out of all the children.

Kathleen and Will have five children.

3 girls

Megan Gordon -13 years old

Ashley Gordon -8 years old

Jessica Gordon -3 years old

2 boys

Conner Gordon -11 years old

Caleb Gordon- 1 year old

Nancy Matthews, married to John Matthews

Nancy is an OB-GYN. John is a Lawyer

Nancy is the second oldest.

Nancy and Matthew had four children

2 girls

Haley Matthews- 8 years old

Kimberly Matthews- 2 years old

2 boys

Joshua Matthews- 14 years old

Jonathan Matthews- 5 years old

Jennifer Scott, Married to Nathan Scott

Jen is a Neurosurgeon. Nathan is a general surgeon.

Jennifer, also known as Jen, is the middle child.

Jen and Nate have five children

4 girls

The Twins

Lila Scott- 9 years old

Lindsey Scott- 9 years old

Maggie Scott- 6 years old

Lauren Scott- 3 years old

1 Boy

Logan Scott- 5 months old

Danielle Shepard

Youngest child of the Shepard clan

Only 24 and dating around

Can't seem to find the right guy.

Family teases her a lot about not having any kids.

She is in medical school.

This is a story about their big crazy Christmas gatherings in New York.