S1·E6 Nobita's Bride

The episode starts with Nobita and Doraemon celebrating Nobita's birthday. Then they go to the future and they try to find Nobita's bride, who turns out to be Shizuka. Then they almost get beaten up by Nobita's son in the future due to a mix-up, for Nobita's son looked just like him. The two escaped with injury and find Shizuka in Nobita's house presenting him with a present. The episode ends with Shizuka and Nobita walking away.