Any reason why you think Erin was chosen to play Tabitha and not Diane ?

at first, they both played her. But then when they were about 5 years old they realized that they're fraternal twins; and they chose Erin to mostly play her because she resembled Liz more than Diane did.

they looked too different...this is from the first season they played tabitha. there is a significant difference in appearance.

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dianne on the left, erin on the right.

Not to mention that Erin looked much more like her TV mom, Liz Montgomery. Even today, Erin looks very much like Liz!!

and diane was more spastic. she was like the ADHD tabitha. it's very obvious if you look for it. shes sooo cute.