Quit Claim deed for house in Ill. signed by owner to 2 adult children. Are children now responsible for tax and other debts?

Mom signed Quit Claim deed in 2001 giving house equally to her 2 children while maintaining life estate. Her son has mom's Power of Attorney. In 2013 he convinced her to live with him & his wife in another city. Mom is 87 & easily convinced so she moved in with him. He had her cash in all financial accts, about $40,000. Mom pays him $650/mo. for living expenses. She receives social security & a pension from deceased husband. After living with him for a month, he told mom we have to sell her house, she really needs money. I tried to explain to her she has money, but brother cut me off. He will give me no info regarding her assets, expenses, etc. He says she needs to go in a nursing home but can’t get Medicaid until she sells house. Her 2014 property tax statement shows she no longer gets the “Senior Citizen” or “Senior Assessment” freeze & now has a tax debt of over $1,000. He tells me I am responsible for that debt & he had the county change the name on her account from “her” to “her etal”. Am I responsible for the tax debt and other expenses?