That is very far from Xingang to Shi Family Mansion (about 80km), for Xingang is in the east port are of Tianjin and the Shi Family Mansion is in the far west suburb of Tianjin, nearby Tianjin West Railway Station (Yangliuqing Station). 便民9号 is a bus line from Xingang to Yangliuqing, a yellow mirocbus, but it may take 2 hours. It may approximately cost some 200RMB or more, for I calculate the cost by the regulated taxi price. yes, you can talk about the price with the driver.