On Monday night's episode of MTV's "Teen Mom OG," Farrah Abraham tried to keep her late boyfriend Derek Underwood's spirit alive for their daughter Sophia, Amber Portwood announced the date for her upcoming wedding to fiancé Matt Baier, Maci Bookout's co-parenting relationship with ex-fiancé Ryan Edwards hit another roadblock and Tyler Baltierra comforted his fiancée Catelynn Lowell as she suffered from nerves and anxiety on the walk up to the meeting between their new daughter Nova and Carly, the daughter they placed for adoption when they were teenagers.

Farrah Abraham

Abraham's late boyfriend Derek Underwood passed away in a car crash just months before she gave birth to their daughter Sophia, which was documented in previous episodes of "16 and Pregnant" and "Teen Mom." Sophia had been asking about her father, so Abraham scheduled a trip to visit Underwood's grave and spend time with his parents Debbie and Jerry.

Underwood's parents accompanied Abraham and little Sophia to his grave, and the 6-year-old said, "I wish we could see daddy Derek in real life." Debbie and Jerry gifted Sophia with a photo of her dad when he was a child, and Abraham couldn't hold back her tears. "I'm trying not to do this," Abraham said, looking away so Sophia couldn't see her cry.

Amber Portwood

Portwood is involved in a tense custody battle with her ex-fiancé Gary Shirley for their 6-year-old daughter Leah. Little Leah referred to Shirley and his girlfriend Kristina as her "parents," which bothered Portwood, but she didn't let it stop her from enjoying her time with her daughter.

During a trip to an apple orchard with her fiancé Matt Baier, her mom and Leah, Portwood announced to her mother that she set a date for her upcoming wedding to Baier. Portwood's mother wasn't very enthusiastic because she doesn't approve of her daughter's relationship with Baier, but Portwood told her mom that she doesn't have any doubts. "I've been engaged four times before and called it off," Portwood told her mom. "You know I wouldn't go through with it if I wasn't sure."

Maci Bookout

Her co-parenting relationship with ex-fiancé Edwards has never been an easy one, but now that their son Bentley is 7 years old, Edwards is beginning to lose time with his son on weekends because of social activities like sleepovers. Edwards was upset that Bentley wasn't allowed to spend a Sunday night with him to make up for losing time on a Friday night, and even though Bookout stressed that it's important to keep their son in a routine on school nights, she allowed Edwards to pick up Bentley from school the following week.

Edwards dropped him off at Bookout's and attempted to talk with her about visitation, but he arrived an hour late and Bookout refused to talk until Edwards proved that he can be more reliable in their son's life.

Catelynn Lowell

Lowell and her fiancé Tyler Baltierra packed up and set off for their wedding ceremony in Charlevoix, Mich., but her upcoming nuptials and the meeting between their second daughter Nova and first daughter Carly had Lowell sick in bed with anxiety. Baltierra and Lowell placed Carly with adoptive parents Brandon and Teresa six years ago, and Lowell was nervous about how Carly would react to meeting her little sister Nova.

But even though things went well and the sisters bonded, Lowell was still anxious about her upcoming wedding ceremony where she said it would be difficult "seeing my two kids together and only taking one home." She also worried that marrying Baltierra, her boyfriend of 10 years, would somehow change their relationship. Lowell cried and Baltierra pulled her into his lap and comforted her.

Watch a deleted scene from the episode below.