Everyone in Ali's family knows. Spencer's dad know because he is their dad. Eventually, the DiLaurentis family tells the public that Courtney is her twin.
it is alison's sister
Just look up a picture of Allison from Pretty Little Liars, because they are identical twins.
Ian, who is Spencer's sister Mellisa's husband, kills her.
At a mental place. And is made to live her dead twin sister
Jenna is Toby's step sister in pretty little liars. She got blind after Alison threw the stink bomb into the house,unaware of someone being in it.
Yes. Alison had a twin sister named Courtney.
yes
Ally's psychotic sister.
Yes
Courtney is alison's twin sister, who pretended to be her
Yes
Obviously. she gave birth to them
Because the Pretty Little Liars weren't actually her friends. Courtney, (Alison's twin sister) made friends with them. Alison had nothing to do with them. So she's mad and tries to kill them.
it is alison's sister
No the girls do not know.
Alison has a mentally insane, twin sister named Courtney.
Just look up a picture of Allison from Pretty Little Liars, because they are identical twins.