Nathaniel Jacob Andrews is a character on Mean Big Sister. He is the the third child and only son of Jerry and Kate Andrews, the baby brother of Jessica and Ashley, the nephew of Mark, Becky, Teresa and Jeff, and the cousin of Roxie and Jack MacAllister. He was born in the episode "And then there were three and is currently 3 years old.
When she started to crawl: February 2016
When he started to walk: July 2016
When he said his first word: December 2016
When he sat on the potty for the first time: unknown, somewhere between December 2016 and September 2017
When he finished potty training: unknown, maybe he already has since he's 2