Tina has a twin brother named Bobby, whom she supplies with jet to feed his addiction. She admits that it was she herself who caused him to become an addict, but she is also eager to help him get clean, and so seeks help from the Sole Survivor. She is also rumored to be having an affair with Holt Combes, father of Erin.
pcps4xboxone Tina is meant to be optionally recruited as a Tier 4 merchant at the end of Dependency, but due to a larger bug with traders she cannot be successfully recruited unless Bobby De Luca is dead. If asked, she may initially agree only to immediately express confusion at the idea; even if she agrees, the Workshop assignment menu will not come up, keeping her stuck in Vault 81 indefinitely.
ps4 Another confirmed method of avoiding the bug is to insult Bobby (use only the speech options on the right) until he attacks you when you first speak to him after speaking with Tina. After killing him, speak with Tina again and, if you pass the speech check, there will be no bug. She will have normal dialogue followed by a prompt asking which settlement you wish to send her to.[verified]
ps4 After Tina moves to one of the players settlements she will stop talking this is because she does not have any settler dialog unless she is moved to Vault 88, but even then she will just repeat the dialog she says when leaving Vault 81.[verified]
pc You can still get her in case you didn't killed Bobby De Luca in the quest Dependency, use the command resetquest V81_03 and then setstage V81_03 100 to restart the quest and then kill him.