请问8老师关于privacy 的问题

8老师：Thanks for your immediate reply. How is it possible to avoid sharing my personal financial information

to my family members while we are using the same login provided by the NVC to fill out family application form

DS-260 and upload my personal Tax Return and Form i-864 for affidavit of support from the login? Also, do they have to bring

the form I-864 with them when they go to interview? Please explain. Thank you again.