Families:

1

Zhongli (parental figure, basically the father)

Xiao (adoptive son, the son)

2

Ei (mother)

Yae Miko (girlfriend, basically the other mother)

Scaramouche (son)

3

Jean (mother figure, Barbara's older sister)

Lisa (mother figure)

Albedo (oldest son)

Klee (youngest)

Barbara (Jean's younger sister, in no way related to Albedo or Klee but acts like a cousin to them)

Alice (Klee and Albedo's biological mother)

Lisa and Razor (mother and son duo but in no way related)

4 

Nahdia (an aunt to Scaramouche)

5

Diluc (Kaeya's adoptive brother)

Kaeya (Diluc's adoptive brother)

6

Venti (drunk uncle to Scaramouche)

7

Ningguang (mother figure)

Keqing (sister figure)

Ganyu (sister figure)

8

Lumine (Aether's twin sister)

Aether (Lumines twin brother)

Friendships:

1

Klee (best friend's with Diona, Qiqi and Sayu)

Diona (best friends with Klee, Qiqi and Sayu)

Qiqi (best friends with Klee, Diona and Sayu)

Sayu (best friends with Klee, Diona and Qiqi)

2

Albedo (friends with the twins)

Aether (friends with Albedo)

Lumine (friends with Albedo)

3

Venti (best friends with Lumine)

Lumine (best friends with Venti)

4

Barbara (friends with Venti)

Venti (friends with Barbara)

5

Tignhari (good friends with Collei)

Collei  (good friends with Tignhari)

6

Keqing (close friends)

Ganyu (close friends)

7

Xiao (best friends with Aether)

Aether (best friends with Xiao)

8

Venti (good friends with Aether)

Aether (good friends with Venti)

9

Zhongli 

Nahdia

Raiden Ei

Venti

you'll see ;)

School

Teacher's:

Lisa (school librarian)

Students:

Albedo

Lumine

Aether

Scaramouche

Venti

Xiao

Ganyu

Keqing

Collei

Barbara

Tignhari

Razor

Class 1

Kaeya (teacher)

Aether

Venti 

Albedo (art kid)

Xiao (loner)

Amber (vice class president)

Keqing (class president)

Xinyan

Gorou

Class 2

Mona (the teacher)

Collei

Scaramouche (misunderstood bully)

Lumine

Razor

Nilou (popular girl)

Kokomi (popular girl)

Ganyu 

Barbara (straight A student)

Class 3

Rosaria (teacher)

Faruzan 

Candace

Cyno

Itto (class prankster)

Yoimiya

Hu tao

Xingqiu (rich kid)

Noelle

Pre-school students:

Diona

Sayu

Klee

Qiqi

Yaoyao

Dori