–Lainey’s main catchphrase
Lainey is sometimes kind and spent most of her time with Barry. When she went to college, she was usually kind to both Ericas, but seemed more snotty to Barry and Adam. With being popular, she seemed sometimes like an antagonist to Adam, with calling him "geeky" and "nerd". It is clearly shown how Lainey's personality changes throughout the plot of the show. In the finale of Season 5, Barry and her share a dance and Barry brings up the idea of marriage, and Lainey accepts the idea, which makes them engaged.
Bill Lewis (father)
Bill is the father of Lainey. Even if they are not seen to interact often, it is implied that they love each other very much. When Lainey's mother left them, Bill raised his daughter alone.
Nothing is known of Lainey's grandmother, except that once her mother abandoned her, she helped Bill grow Lainey. When Barry made her believe she was dead, to allow her out of school, Lainey was heartbroken, so she must love her very much.
Nothing is known of Lainey's mother, except that at one point she left home devastating Bill and Lainey. Her example has negatively influenced Lainey, since he had made her choose not to fall in love until she met Barry, for fear of ending up with a broken heart.
Erica Goldberg (best friend)
Erica and Lainey are best friends, presumably from childhood. They trust each other very much, and Lainey always tries to help her friend. The only real problem that ever arose between the two was Lainey's relationship with Barry, Erica's younger brother. Erica did not approve of their story, while Lainey often neglected her friend in favor of Barry. On some occasions Erica has even tried to make them leave, only to repent and help them clear up. Lainey, however, never brought her a grudge, and when Erica admitted that she had tried to use the JTPs to separate Barry and Lainey because she missed the latter, she stopped neglecting her.
Adam F. Goldberg (friend)
Lainey and Adam did not interact much, but for what little they do they seem to get along. Lainey has asked Barry to be kinder to Adam, and when Adam was sad because Barry spent all of his time with Lainey, instead of with him during the Christmas holidays, Lainey went back home, so that Barry would pay attention to brother and later Adam willingly allowed Lainey to join them. The two also share a love of theater, and Adam also seems slightly attracted to Lainey.