If you don't want your children to sell the house, you can also tack on a provision that the inheritance can not be divided for 10 years, as a means of maintaining the status quo.
如果不願意子女擅自變賣房屋，還可以在遺囑中加註「遺產在十年內不能分割」的條款，做為一種「保持現有狀態」的手段。