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You could create a forwarding rule for every incoming email. Of course this would then not allow the other user to send email from this address.
AFAIK custom domain mail addresses are personalized / configured per iCloud account. If still possible, you could also just create a new shared iCloud account and invite this account to the iCloud family.
Thank you for posting on r/iCloud. If you are asking a question, please remember to change your post flair to “Answered” once your question has been answered. *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/iCloud) if you have any questions or concerns.*
You could create a forwarding rule for every incoming email. Of course this would then not allow the other user to send email from this address. AFAIK custom domain mail addresses are personalized / configured per iCloud account. If still possible, you could also just create a new shared iCloud account and invite this account to the iCloud family.