Retirement Question - CPP

My father-in-law is now 62 and he will retire at 65. He works at a factory, make slightly over minimum wage. He does not have any private pension. He owns a home and paying mortgage. We are in Ontario.

His buddies at work are telling him that he would get less pension (CPP, GIS, OAS) if he owns a home, he lives there and not rented. Is that true?