*** Thread moved from Bringing Family Members of US citizens (consular processing for parents/siblings) to Adjustment of Status work/tourist/student visas - please post here for future questions on AOS ***
this is the way to go. Apart from Amex as pointed out by @OldUser, other credit cards statement will not state the authorized user’s name anywhere. We included Amex statements but also included photocopies of other physical credit cards since they show the same card number, expiration dates and our names.