Much is known or speculated about the historic wife of Crassus, known as Tertulla. She was the only known daughter of Consul Marcus Terentius Varro Lucullus. Since "Tertulla" (or Tertia) was a name given to the third oldest daughter, she probably had two older sisters (both of whom may not have survived to adulthood), as well as possibly bearing the name Terentia Varra along with his two sisters, thus becoming Terentia Varra-Tertulla, or Tertia. His date of birth is also unknown.
Given that his father was born around 116 BC, and the legal marriage age for boys was at least 14, Tertulla's birth date would be 102 BC to 100 BC Tertulla was known to have been married to Publius , Crassus' older brother, who died during the winter of 87-86 BC, alongside his father Publius Licinius Crassus Dives.
With the legal age of consent for young women in Rome being 12 years old, Tertulla and her first husband Publius were married in 90-88 BC. After the Social War ended in 88 BC, Tertulla married Marco Crassus sometime between 88-87 BC. She had two children with Crassus, Marco and Publius. It is not known whether Marco or Publius was the eldest son, since Marcus would have been born between 86-85 BC, and Publius' date of birth was recorded as being between 86-82 BC.
It is assumed that Tiberius is a substitute for Marcus, and has had his name changed to avoid confusion with his father. However, his son Marcus is registered as born in 86-85 BC, making him too young to serve in his father's legions in the Third Servile War, being only 15 or 14 years old during the rebellion.
Tertulla would later become the mother-in-law of Cornelia Metella (the last fifth wife of Pompeu Magnus), who married her son Publius, and Caecilia Metella, who married her son Marcus. Tertulla became the grandmother of Marcus' only known son, also called Marcus Licinius Crassus, who served as consul in 30 BC.