financing question- non occ co-borrower putting all $ down

[Sierra Swords]

Hello! 

I am curious about rules for house-hacking a 4 unit multi-family. I want to buy a 4-unit in my hometown (I am four hours away) for my sister to live in one unit. She would be the owner occupant. I would be a 'coborrower'. As the co-borrower, can I put all the money down and use my DTI to qualify? She has no W2 income and no savings. Is this even possible?

Thanks for any guidance! I have an email in to a lender but I know there are lots of lenders here that could probably answer faster!

Best,

Sierra Swords