Your question seems simple but is very complicated.
Yes there are lenders who will not count a specific debt in a borrowers ratios if significant proof is shown that someone else makes the payment on that debt.
Contact a local lender who will take the time to review your situation... you will most likely get lost in a "call center" and get a total run around.
Make sure the lender you talk with has been in the business long enough to know true manual underwriting and will look at all options for you.