Can I add a sibling tool after my membership starts? Kidstir Team October 19, 2020 20:48 Updated To add a sibling tool after your membership has started, please contact us at firstname.lastname@example.org and we'd be happy to make those changes to your account. Additional fees will apply. Related articles How do I cancel my membership? Do boxes ever repeat? Can I choose when to begin my membership? Comments 0 comments Article is closed for comments.