SMLLCs?    Disregarded for tax purposes, just file a 4868.  His state may be a different story.

is he a sole proprietorship ?

Yes he is a Sole proprietorship.

But what do you do if he is not.

Thanks.  He is in Texas.

Choose one LLC to do the Franchise Tax in ProSeries.  Do each of the other Franchise Tax filings on the State Comptroller website directly.