The Duggars are heading to New York City to be featured on NBC's Today Show as part of Mother's Day. However, Michelle and Jim Bob Duggar have a big secret – Michelle is expecting baby #18, and the Duggars are trying to keep the news a secret until they can surprise the other 17 children on national television.

The Duggar's visit to New York City continues, as they visit Central Park and Times Square.

This episode features the Duggars rules about dating and courtship and includes a hidden camera view of oldest son Josh popping the big question to his fiancee Anna on her 20th birthday.

Josh brings Anna to Arkansas after the engagement in the last episode. The Duggars explain their beliefs about relationships with the opposite sex, where hand holding is a privilege, chaperones always accompany the couple and (in addition to their opposition to premarital sex) saving your first kiss for your wedding day is a must.

The Bates clan, a fellow mega-family from Tennessee (Gil, Kelly and their 16 children, with another on the way), decide to pay the Duggars a visit to their new Arkansas home. The episode centers around the logistical challenges of nearly 40 people in one house, as well as the similarities and differences between the two families.

The Bates and Duggars compete in paintball and dare each other to jump out of an airplane.

The Duggars explain their ways of thriftiness -- they do not use credit cards, only debit cards or cash; they purchase clothing from second hand stores, groceries from Aldi, grow their own vegetables, use firewood (from trees on their property) to heat their home and even have a recipe to make their own laundry detergent.

Each Duggar has his/her own chores (or jurisdictions, as they call them), which are somewhat gender-specific. However, Jim Bob decides that, on this day, the jurisdictions will switch and the boys will do the cooking, laundry and cleaning, while the girls learn the basics about car repairs.

The Duggars take a trip to Ohio for Michelle's family reunion. On the way, the family visits the Creation Museum in Petersburg, Kentucky where animatronic dinosaurs roam the earth with Adam and Eve. Prior to the trip Michelle goes in for an ultrasound, whereby the family learns that baby #18 is a girl.

Jinger successfully passes her driving test. The Duggars also celebrate Michelle's birthday and discuss their upcoming book.

The family prepares for the arrival of the newest Duggar, Jordyn-Grace Makiya who will be delivered by Caesarean.