Why does my mom go insane anytime I bring up that she and my dad should get a will for the house.

Or if I bring up my wishes that I can live in the house when they are gone. (I've lived with them most of my life and still do) I consider this my home. I've never been married, never had a real partner. I've struggled my whole life trying to make more money. They see this. But have no understanding of why I'd be better off in life here with a house my dad's father ended up paying off years ago. It is paid off and the only bills we have are internet and electric. They make up excuses that I won't be able to afford it, or like my mom mentioned tonight that I wouldn't keep it up or mow the grass. I told her no one has asked me to mow. Plus I'd be taking care of it more than they do. Weeds are completely overgrown in the garden. I'm about to take care of that myself soon. I trim the ivy off couple times a year. I'm the one taking care of ant problems we have. They sit and watch tv all day long while I'm washing dishes or dusting and whatever else. Why would a parent wish for me to be homeless versus just living in the house I've always known my whole life. It's not even a sensitive subject, but she treats it like it is!! Gets so irate when it is brought up