Plot hole: The beginning of the film takes place in 1973 right after the original Texas Chainsaw film ends. Right after the house is burned, one of the townspeople takes a baby who survived the fire who is Heather. The film then takes place in 2012 but Heather seems 20 years old and should be 39.

Texas Chainsaw 3D (2013)
1 review
Directed by: John Luessenhop
Starring: Alexandra Daddario, Scott Eastwood, Tania Raymonde, Dan Yeager, Trey Songz
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(2 votes)
7.2/10.A pretty decent direct sequel to the original.I thought it was nice that they had Gunnar Hansen there as well as screened it for Tobe Hooper.Alexandra Daddario is a break out star here.Clearly she got the material and ran with it.They focus on what made the original great and crafted a well told story here.The idea of making the Sawyers sympathetic was an novel concept that paid off.If anything I was entertained, never bored, this worked well even if they never do another sequel.
Darryl: Family's a messy business. Ain't nothing thicker than blood.
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Answer: We are to presume they are extended family members and/or associates of the family that we simply didn't see in the original film.
TedStixon