Hello, question for you. My mom owned a property in Illinois that my brother and sister-in-law moved in to with the intent to buy it. They added new HVAC system and then a year later decided not to buy the property and moved out. They only paid the HVAC company 1k out of 18k. They did not have a rental agreement or anything in writing from my mom to remodel the home. My mom sold the home right after they moved out, about 4 months ago. Now my sister-in-law claims my mom has to pay the HVAC bill even though it's in my sister-in-law and brother's names. Could the HVAC company place a lien on the home that the work was done at, even though my mom sold it?