Most likely the multi-member LLC was formed as a partnership. If that is the case, the partnership must file its own Form 1065 return. Then, each member of the partnership will get a K-1 to report their share of the income/expenses on their personal returns.
Take a look at the paperwork you received from the IRS when the multi-member LLC was formed. The IRS paperwork showing the assigned Federal ID number will tell you what type of return is required to be filed.
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