@gordonr is in relation to sky email accounts or tv/broadband accounts, for the latter you can't add additional users as account holders, but you can add a named individual by calling sky and setup a telephone account password, they will then be able to do most things over the phone but won't be able to cancel any services
Sky also don't allow new sky yahoo email accounts therefore you will need to use an alternative email service
(edited to reflect @Mark39 's answer re email accounts)
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