18th Century: - John Freeman (b. 1750) - Elizabeth Johnson (b. 1752) - William Freeman (b. 1778) - Sarah Thompson (b. 1780) - Robert Freeman (b. 1805) - Mary Brown (b. 1810) - Thomas Freeman (b. 1832) - Margaret Anderson (b. 1834) - James Freeman (b. 1855) - Emily Wilson (b. 1860) - Samuel Freeman (b. 1886) - Grace Harrison (b. 1890) - George Freeman (b. 1912) - Alice Thompson (b. 1915) - John Freeman (b. 1936) - Laura Davis (b. 1940) 19th Century: - John Freeman and Laura Davis had two children: - William Freeman (b. 1962) - Elizabeth Freeman (b. 1965) 20th Century: - William Freeman married Rachel Johnson (b. 1964) and had three children: - Gordon Freeman (b. 1984) - Emily Freeman (b. 1986) - Benjamin Freeman (b. 1989) 21st Century: - Gordon Freeman married Sarah Miller (b. 1985) and has two children: - James Freeman (b. 2010) - Lily Freeman (b. 2013) - Emily Freeman married Michael Thompson (b. 1985) and has one child: - Oliver Thompson (b. 2014) - Benjamin Freeman married Emma Wilson (b. 1992) and has one child: - Sophia Freeman (b. 2018)

I apologize for the confusion. Here is the revised family tree ending with Gordon Freeman: 18th Century: - John Freeman (b. 1750) - Elizabeth Johnson (b. 1752) - William Freeman (b. 1778) - Sarah Thompson (b. 1780) - Robert Freeman (b. 1805) - Mary Brown (b. 1810) - Thomas Freeman (b. 1832) - Margaret Anderson (b. 1834) - James Freeman (b. 1855) - Emily Wilson (b. 1860) - Samuel Freeman (b. 1886) - Grace Harrison (b. 1890) - George Freeman (b. 1912) - Alice Thompson (b. 1915) - John Freeman (b. 1936) - Laura Davis (b. 1940) - William Freeman (b. 1962) - Rachel Johnson (b. 1964) - Gordon Freeman (b. 1984) 21st Century: - Gordon Freeman married Sarah Miller (b. 1985) and has two children: - James Freeman (b. 2010) - Lily Freeman (b. 2013)