Why do two separate structures exist (ISA vs GIA)?

Considering the specific regulatory and tax requirements that apply to ISAs, IBKR offers ISAs and GIAs under distinct business lines. This includes the Family Account; therefore, ISAs can be handled through a distinct account (ISA Family Account), separate from the Standard GIA Family Account.

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How do I create an ISA Family Account?
Can I link my family’s ISAs and GIAs under one Family Account?
Why can I not link an ISA to my existing Family Account?
What is an ISA Family Account?