|“|| Alaric: I just want one of the doctors here to check them out first. We can take them home in the morning. Listen, uh... the things I said... I'm sorry. I'm really sorry.
Caroline: You were right. Genetically, they are not mine. But I gave birth to them, I raised them, I loved them... and when they went missing, I felt like I was dying. So don't you ever throw that in my face again.
They became a family when it was discovered Caroline was pregnant, as a surrogate mother, to Alaric and his deceased fiancée's (Jo Laughlin) twin daughters. Caroline decided to keep the babies and gave birth to them in This Woman's Work. Caroline then decides to help Alaric raise the babies after he tells her that he plans on taking them out of Mystic Falls. Caroline and Alaric become engaged throughout the three years of helping each other raise the children, which strengthened their family bond as the twins grew older. Alaric and Caroline continue to raise the twins although their engagement fell through.
During Season Eight, Alaric and Caroline continue to raise their daughters together despite their broken-off engagement. However, due to Damon's influence under Sybil's mind control, the girls are put in danger once again. Once Sybil is put down however, Kai Parker returns and puts their daughters' lives in danger for the second time in their lives. Once everything is resolved after this season and after Stefan's death, Alaric and Caroline turn the Salvatore Boarding House into a school for supernatural youngsters in which their daughters grow up in and attend.
Throughout The Vampire Diaries Series
In Mommie Dearest, it is revealed by Valerie Tulle that Caroline holds Alaric's thought-to-be-deceased twin daughters in her womb. Alaric and Caroline are overjoyed that she is pregnant with the babies as a surrogate mother.
In This Woman's Work, Caroline must undergo emergency Cesarian section (C-Section) to deliver her babies. Valerie Tulle and Stefan Salvatore assist the nurses in Mystic Falls Hospital as the Heretics also help Valerie deliver the babies. Lizzie and Josie are successfully born as Rayna Cruz threatens their lives.
In Somebody That I Used to Know, Josie and Lizzie are heard inside the house as Alaric opens his front door for Stefan after he knocked. Stefan watches Caroline kiss Alaric on the cheek as she says that she would tuck the daughters in bed that night instead of Alaric. Stefan watches in heartbreak as Caroline ignores him completely as Alaric shuts the door on his face.
In Gods and Monsters, Alaric and Caroline tell their daughters of their Siphoner heritage and they open the Armory together. Caroline and Alaric later break off their engagement, but Caroline promises to stick around as a family.
In Hello, Brother, Alaric shows up at Caroline's house to see their daughters. Alaric then mentions the idea of moving in together, which Caroline goes against. They also discuss the stress it has put on both to raise their twin daughters, especially with Alaric at work at the Armory and Caroline's current relationship with Stefan. Caroline still rejects the idea of moving in together again, again mentioning Stefan and the awkward situation it might pose. This leaves Alaric disappointed before heading back to the Armory to further investigate the creature's vault.
Later, Caroline gets a call that someone showed up to their house while the babysitter was watching Lizzie and Josie. Caroline finds them hiding in her closet and then she interrogates Virginia St. John for invading her home, shortly before Virginia kills herself in Caroline's home.
In Coming Home Was a Mistake, at the end of the episode, Caroline and Alaric figure out from Matt Donovan that Seline, Josie and Lizzie's babysitter, is the second siren. Alaric and Caroline are forced to run home only to find a drawing made by one of their kids holding hands with Seline and with Seline next to a man named, Cade.
- Alaric and Caroline are the first couple ever to birth babies from a vampire's womb (Caroline as a surrogate mother).
- Josette Laughlin is the twins' biological mother. She died however during Alaric and Jo's wedding.
- Alaric was engaged to both women who conceived, carried in the womb, and birthed his children.
- Alaric and Caroline are still willing to work together, despite calling off their engagement, in raising their children.