(b) Lisa, aged 79 and in good health, asks your advice on minimizing the inheritance tax payable on her estate. Lisa is widowed and has three children and four grandchildren. Two of Lisa's grandchildren are due to get married later this year, and another of her grandchildren has just become engaged to be married. Lisa's estate is valued at 700,000; this consists of her main residence (valued at 500,000); cash of 50,000; and a holiday cottage valued at 150,000. Lisa lives comfortably off her pension of 50,000 p.a. Required: Advise Lisa how she can minimise her inheritance tax liability. (9 markel