'She's just a kid': 10-year-old stepdaughter gets overlooked during a family gathering when she's the only kid not to get a gift bag, leading her mom to confront the family

The cousin is the one who wrote the story below, and they tried to defend their action, while fully admitting that they treat that 10-year-old girl differently because she is not biologically related to them.
Keep scrolling to read the full story, and let me know what you think of the situation in the comments down below.
01

via Dimedrol68

^{The image does not depict the actual subjects of the story. Subjects are models.}
Advertisement
02
"AITA for treating my cousin's stepdaughter differently?"

via MGL_Santos_
03

via MGL_Santos_
04

via MGL_Santos_
Advertisement
05

via MGL_Santos_
06

via MGL_Santos_
Advertisement
07

via MGL_Santos_
08

via MGL_Santos_
Advertisement
09

via MGL_Santos_
10

via MGL_Santos_
11

via MGL_Santos_
Advertisement
12

via MGL_Santos_
13

via MGL_Santos_
14

via MGL_Santos_
Advertisement
15

via MGL_Santos_
16

via MGL_Santos_
17

via MGL_Santos_
Advertisement
18

via MGL_Santos_
19

via Monkey Business Images

^{The image does not depict the actual subjects of the story. Subjects are models.}
20

via BoredofBin
Advertisement
21

via BoredofBin
22

via MGL_Santos_
23

via Humble-Can-4229
Advertisement
24

via Humble-Can-4229
25

via MGL_Santos_
26

via BoredofBin
Advertisement
27

via BoredofBin
28

via MGL_Santos_
29

via Insomnia_and_Coffee
Advertisement
30

via Jocelyn-1973
31

via MGL_Santos_
32

via MGL_Santos_
Advertisement
33

via alphabetacheetah
34

via WickedAsh111
35

via WickedAsh111
Advertisement
36

via WickedAsh111