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. You can get Tina to leave the vault by doing the quest "Dependency" in the following order: 1st, talk to Tina. 2nd, talk to Bobby (pointing a gun at him and got the options "get help" rather than "Tina sent me"), convince him to go see Rachel. 3rd, talk to Tina and persuade her to work for you (she will still reply with confusion at the end). 4th, talk to Rachel. Now, when you go talk to Tina she is leaving the vault 81 saying "I can't believe I get to see the Commonwealth".
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]