Tara is the product of an affair King Markov ( Brion 's father ) had with an unnamed American woman .
Geo - Force is the brother of Tara Markov , also known as Terra , of the Titans .
Tara Markov is the product of an affair Geo - Force   ( Brion 's Geo - Force ) had with an unnamed American woman .
Geo - Force is the brother of Tara Markov , also known as Terra , of the Titans .