Home Alone (1990)

The McCallister family prepares to spend Christmas in Paris, gathering at Peter and Kate's home in a suburb of Chicago the night before their flight. Eight-year-old Kevin, their youngest son, finds himself the subject of ridicule from his siblings and cousins. After getting into an argument with his older brother Buzz, he is sent to the third floor bedroom of the house, where he wishes his family would disappear. During the night, a power outage resets the alarm clocks and causes the family to oversleep. In the confusion and rush to reach the airport on time, Kevin is left behind and the family does not realize it until they are already airborne. Once in Paris, his mother and father desperately try to book a flight home.

Meanwhile, Kevin wakes up to find the house empty and is overjoyed to find that his wish came true. He practices shooting with Buzz's BB gun, jumps on the bed, watches a gangster film, and eats a large serving of junk food, but in the process accidentally wrecks Buzz's room. However, he finds himself frightened by the appearance of the Chicago Police Department called by his parents to check on him; his next door neighbor "Old Man" Marley, who was rumored to have murdered his family many years earlier; and the appearance of The Wet Bandits, Harry Lyme and Marv Merchants, who are breaking into other vacant houses on the block.

On Christmas Eve, Kevin overhears Harry and Marv discussing plans for breaking into his house that night. After conversing with a Santa Claus impersonator and watching a local choir perform in a church, he comes across Marley. The two of them talk, and he learns that Marley is in fact a very nice man and the rumors about him are not true. He tells Kevin he is watching the choir because his granddaughter is in it, and he never gets to see her because he and his son have not spoken in years after a big argument they had. Kevin advises him to reconcile with his son.

After leaving the church, Kevin heads home and sets up various booby traps inside the house. Harry and Marv break in. After the two spring every trap in the house, Kevin flees to the second floor of the house and dials 9-1-1. They chase him out of the house and he flees to the vacant neighboring home. The Wet Bandits catch him when he runs to the top of the stairs and hang him on a coat hook on the door. Marley sneaks up behind them and knocks them out with a snow shovel and takes Kevin home. Shortly after, Harry and Marv are arrested.

Kevin wakes up the next morning and is disappointed to see that his family is still gone. He then hears Kate enter the house, calling for him. He goes downstairs and the two of them meet and reconcile. Immediately after, the rest of the McCallisters, having traveled directly from Paris to Chicago, arrive. Kevin keeps silent about his encounter with Harry and Marv, although Peter finds Harry's missing gold tooth and wonders what it is. Kevin and Buzz have a moment of reconciliation. He then goes over to the window and sees Marley greeting his son and his family. As he is hugging his granddaughter, he looks up to see Kevin. He waves at him and Kevin waves back, smiling. He watches as Marley heads inside with his family. Buzz interrupts him by calling out, "Kevin, what did you do to my room?", at which point Kevin runs off and the film ends.

Home Alone 2: Lost in New York (1992)

The McCallister family prepares to spend Christmas in Miami, Florida. Ten-year-old Kevin, Peter and Kate's youngest son, sees Florida as contradictory to what he thinks an appropriate Christmas environment is, particularly noting the lack of Christmas trees. During the school Christmas concert, Kevin's older brother Buzz humiliates him during his solo, causing Kevin to retaliate. Kevin refuses to apologize for his actions, and, still angry with the family's decision to go to Florida, he storms up to the third floor bedroom of the house, where he wishes that he had his own money so he could go on his own vacation. During the night, Peter unknowingly resets the alarm clock and causes the family to oversleep. In the confusion and rush to reach the airport on time, Kevin gets onto a flight to New York City while loading his Talkboy with new batteries and the family does not realize it until after they land in Florida. Meanwhile, in New York, Kevin tours the city and uses the Talkboy to check into the Plaza Hotel. However, he finds himself scared by the appearance of a woman tending to pigeons.

On Christmas Eve, Kevin tours the city in a limousine and visits Duncan's Toy Chest, a local toy store, where he meets the philanthropic owner, Mr. Duncan. There, Kevin discovers the proceeds from Christmas sales will be donated to a children's hospital. Mr. Duncan allows him to take a pair of ceramic turtledoves as a gift, instructing him to give one to another person as a sign of eternal friendship. After running into the Wet Bandits, Harry Lyme and Marv Merchants, Kevin is chased to the hotel. Mr. Hector, the hotel concierge, confronts Kevin about the credit card, which came up as being stolen. Kevin flees, but is stopped by Harry and Marv. They reveal that they have escaped from detainment and discuss plans for robbing Duncan's Toy Chest that night, before Kevin flees in the back of a hansom cab.

In Florida, the McCallisters discover that Kevin has been found using Peter's credit card in New York. The family flies to New York and Kate desperately tries to find Kevin. Having noted earlier that his uncle Rob has a townhouse in New York, Kevin attempts to visit him; but the house is vacant and undergoing renovations. In Central Park, he comes across the pigeon lady. However, when Kevin gets his foot caught while attempting to run away, she frees him. After watching a local symphony orchestra perform from a loft above Carnegie Hall, Kevin learns how her life has fallen apart and how she dealt with it by taking care of the pigeons in the park; he promises to be her friend.

After leaving the hall, Kevin heads to the townhouse and sets up various booby traps inside it. Kevin arrives at the toy store during Harry and Marv's break-in, throws a brick tied with a note to Mr. Duncan through the window to set off the store's alarm, and is chased into the townhouse. After the two spring every trap in the house, Kevin flees to a phone booth and dials 9-1-1. The Wet Bandits catch Kevin when he slips on a patch of ice and take him to Central Park. The pigeon lady sneaks up behind them and throws birdseed on them before they can kill Kevin. He sets off fireworks he had bought earlier to signal the police. Shortly after, Harry and Marv are arrested. At the toy store, Mr. Duncan finds Kevin's note and realizes his role in stopping the robbery.

Kate comes across two police officers in Times Square, and remembers Kevin's fondness for Christmas trees. Kevin makes a wish at the Rockefeller Center Christmas Tree. There, he sees Kate and the two of them meet and reconcile. The next morning, a truckload of gifts from the toy store comes to the Plaza Hotel as a reward to Kevin's family. Buzz suggests that if Kevin did not go on the wrong flight, they would not be in the suite with the Christmas tree and free gifts in the first place, and allows Kevin to open up the first present as a sign of reconciliation. During the festivities, however, Kevin goes to Central Park to give the pigeon lady a turtledove, reaffirming his promise. At the hotel, Cedric delivers Kevin's room service bill, totaling $967.43, to Buzz. Peter interrupts Kevin by calling out, "Kevin, you spent $967 on room service?!", at which point Kevin runs back and the film ends.

(Source: Wikipedia - 1 & 2)