James Potter(R.I.P) married Lily Evans Potter(R.I.P) and they had one son named Harry Potter has we all know. Harry Potter married Ginevra ( Ginny) Molly Weasley Potter and they had three children. The oldest son was named James Sirius Potter, the younger son was named Albus Severus Potter and the only girl and youngest child was named Lilly Luna Potter.
The Weasley family:
Arthur Weasley married Molly Weasley and they had seven children. The oldest son was named Bill Arthur Weasley , the second oldest son was named Charlie Weasley, the third oldest son was named Percy Ignatus Weasley , then they had twins named Fred Weasley (R.I.P) and George Weasley, the youngest son was named Ron Bilius Weasley and the only girl and youngest child was named Ginevra Molly Weasley ( but everyone called her Ginny).
Bill Arthur Weasley married Fleur Delacour Weasley and they had three children. The oldest daugther was named Victoire Delacour Weasley, the youngest daugther was named Dominique Delacour Weasley and the only son and youngest child was named Louis Delacour Weasley.
Charlie had no children or wife.
Percy Ignatus Weasley married Audrey Weasley they had two daugthers. The oldest daugther was named Molly Weasley II and the youngest daugther was named Lucy Weasley.
George Weasley married Angelina Johnson Weasley they had twins. The twins were a boy and a girl named Fred Weasley II and Roxanne Weasley.
Ron Bilius Weasley married Hermione Jane Granger, they had two children. The oldest and only daugther named Rose Granger - Weasley and the youngest and only son was named Hugo Granger - Weasley.
The Lovegood family:
Pandora Lovegood married Xenophilius Lovegood they had one daughter named Luna Lovegood.
Luna Lovegood married Rolf Scamander, they had twins. The oldest twin was named Lysander Lovegood Scamander and the youngest twin was named Lorcan Lovegood Saman Derek. While Luna was pregnant Rolf died in a accident and then she married Neville Longbottom and they had one daughter Alicia Longbottom who was born one year apart from the twins.
The Lomgbottom family:
Frank Longbottom married Alice Longbottom they had one son named Neville Longbottom.
Neville Longbottom married Hannah Abbot they had three children. The oldest daugther was named Augusta Longbottom II , the twin daugthers were named Alice Longbottom II and Francesca Longbottom. But Neville and Hannah got divorced peacefully and then he married Luna Lovegood when she had just given birth to the twins and they had one daughter named Alicia Lovegood Longbottom.
The Lupin family:
Remus Lupin(R.I.P) married Nymphadora Tunks(R.I.P), they had one son named Ted Remus Lupin II ( but everyone called him Teddy) and after Remus and Tunks death he was adopted by his godfather Harry Potter when Harry was 18 years old.
The Malfoy family:
Lucius Malfoy married Narcissa Black Malfoy, they had one son named Draco Lucius Malfoy.
Draco Lucius Malfoy married Astoria Grengrass Malfoy (R.I.P), they had one son named Scorpius Hyperion Malfoy and his twin sister Bellatrix (Bella) Astoria Malfoy.