Catelynn and Tyler have shared so much together during their 10-plus years as a couple -- and during this week's episode of "Teen Mom OG," the high school sweethearts will take the next step in their love story and become husband and wife.
In a sneak peek from the special 90-minute installment below, the young parents -- who chronicled their engagement(s), bachelor/bachelorette party and festivities leading up to this milestone on the long-running series -- share some emotional moments with their family before meeting at the altar. For starters, Ty and his father Butch -- who is newly free from a lengthy prison sentence -- reflect on their troubling past and what this occasion means to both of them.
"I missed your graduation by one day -- I was feeling like a really bad father," a teary Butch tells his child. "I mean, I'm already a bad father, but that much worse. I can't tell you how happy I am. You ain't seen nothing but good coming out of this guy."
How does Ty react to the patriarch's heartfelt words? Watch the entire touching exchange in the clip -- plus see Cate's adorable moment with her brother Nick -- and don't miss "Teen Mom OG" on Monday at 10/9c!