Can I use one login for both my Standard Family Account and ISA Family Account?

No. Separate logins are required - one for General Investment Account management and one for ISA management.

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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” and why do I need one?