Can a I borrow from a house that's sold on contract?

[Tony Tibbar]

I've sold a house on contract. It's far from paid of by the buyer. 

Can I borrow against that house?

It's grey area for me who actually owns the house.
Yeah, it's clear I own the house until the last payment is made, but to I have equal ownership compared to my own house I live in myself?

The following scenario makes me think it may be illegal.

The person that bought the house on contract is  a faithful payer. 95% is paid.

Then I loan on that house and can't pay back the loan for whatever reason.

The lender will foreclose the house. That will hurt the person that lives in that house more than it does me, because that person get's kicked out of the house and all his/her payements are gone.

What are the regulations on this?