how can i get someones name taken off the mortgage if hes not paying anymore

Hello, This would be an issue between you and your home lender.  I would call them and discuss this.  If you have a history of paying for the home alone, they should be receptive to pulling the non-paying mortgagor off of the mortgage. One caveat, you may have an issue if the non-paying mortgagor, for whatever reason, wants to remain on the mortgage.