who plays nicky and alex in full house
List of Full House and Fuller House characters Nicholas "Nicky" and Alexander "Alex" Katsopolis, (played by Daniel and Kevin Renteria as babies during season 5; Blake and Dylan Tuomy-Wilhoit as toddlers for seasons 6â€“8) are the twin sons of Jesse and Becky Katsopolis. The two were born in the season five episode "Happy Birthday, Babies," on the date of Michelle's fifth birthday. Becky named Alex after a high school teacher who inspired her to venture into a career in journalism, while Jesse chose to name Nicky after his father, for giving him great hair. They have strawberry-blond hair and are fun-loving toddlers, with minor distinctions between them. Nicky is more quiet and sweet, while Alex is more outspoken and mischievous. They often repeat each other's words.