The Taming of the Shrew 1.2 Performance: Petruchio, Lines 255-260

The transcript discusses a father's rule that his younger daughter cannot marry until her elder sister is wed. This condition restricts the younger daughter's suitors until the elder sister's marriage, at which point the younger daughter is free to marry.

When is the younger daughter free to choose a suitor?

What is the significance of the elder sister's marriage in the context of the text?