Does anyone know how old Zoey's younger brother and Older sister are?

Zoeys brother and sister are only mentioned in Marked. On page 8, she calls them
'my troll-like younger brother and my oh-so-perfect older sister'

then again on page 22 when she is talking to her mum she says;
'did আপনি know that your oldest daughter has turned into a sneaky, spoiled slut?' and
'do আপনি know what nasty, bloody video games Kevin keeps hidden from you?'

and finally on page 33, when she runs away just after she's been Marked..
'the only other windows were to my sisters room and she should still be at cheerleading practice'

After that though im pretty sure they're not mentioned again, in any of the বই that are out.

and i agree that its a little strange how they didn't come to parent visitation in Betrayed.? maybe they're as mean to her as her parents and thats why she hardly spares a thought for them.?

anyway, hope this helps :)

they never say the ages they only mention that they are older and younger, i just keep wondering why they never wanted to see zoey, not even a text message অথবা a visit on the family night they dont seem very nice