Carson's first birthday is celebrated with a bash hosted by Erin; two of the Bates daughters get a driving lesson.
A muddy adventure gets underway when the family ride in four-wheelers, but a change in the weather threatens their fun outing; Michaella and Brandon visit their newest niece.
Lawson gets help with his lawn-care business from his sisters, who are eager to earn some money; Jackson, Warden and Isaiah camp out at the fort; Lawson performs in Nashville.
Erin finishes her album of lullabies in Nashville; Chad and Erin adopt a puppy; an excited and nervous Erin reflects on the difficulties she had during Carson's birth, and she admits she has concerns about her impending labor.
