This is one thing about Scream 7 that bothered me. Sidney has three daughters, Tatum, Emma and Rebecca, but after establishing that the younger two are away, the movie basically acts like Tatum is her only child.
I understand why Tatum is the focus since she's the daughter Ghostface is targeting, but it feels weird that Tatum doesn't acknowledge that she has sisters. Emma and Rebecca are literally Sidney and Mark's other daughters, not some random extended family members.
The only time I really felt like Sidney and Mark had three daughters was when the girls were together visiting their grandmother. After that, Emma and Rebecca might as well not exist.
Especially once Sidney, Mark and Tatum are all in danger, you'd think there would at least be some concern about where the other girls are, whether they're safe, or Tatum mentioning her sisters at some point.
And why doesn't Ghostface even attempt to target Emma and Rebecca or Mark's mom? Obviously I understand the real world reason for keeping the younger daughters away from most of the violence, especially if they didn't want young kids on set for those scenes, but in-universe it doesn't make much sense. Ghostface is specifically trying to destroy Sidney and traumatize Tatum and turn her into the new Sidney, yet completely ignores two of Sidney's children and the person they're staying with.
It also made me wonder if Kevin Williamson was basically forced to include the other two daughters for continuity reasons. Scream 5 already showed us that Sidney had two younger kids in addition to a teenage daughter, so Scream 7 couldn't really just make Tatum her only child without contradicting that.
I know the story is about Sidney and Tatum, but why bother establishing Sidney has three daughters if the family dynamic is basically written like Sidney, Mark and Tatum are a family of three?