Mysterious language, only twins can understand

The fascinating world of twins and the unique bond they share through their own language that develops over time has always fascinated scientists.

Twins Matthew and Michael Youlden , who live in Spain, have developed a unique language called Umeri, which only they speak. The Youlden twins, from Manchester, UK, are renowned for their linguistic prowess, with each of them fluent in 25 languages.

However, Umeri holds a special place in their hearts. They began creating the language as children, and it has evolved into a complex form of communication that continues to connect them, even though they now live in different countries.

The Youlden twins have a special ability for languages, they are fluent in 25 foreign languages ​​and have developed their own hidden languages. (Photo: CaliTwins).

A personal language born from close bonds

The Youldens' journey with Umeri began early, inspired by their close relationship and exposure to different languages.

Dr. Nancy Segal, director of the Center for Twin Studies at California State University, notes that up to 40 percent of twin toddlers develop unique communication patterns, often referred to as "twin talk."

This phenomenon, described as 'hidden language' or 'private speech,' usually disappears as twins grow older and begin to interact with more people. For Matthew and Michael, however, their shared language has only grown stronger, reflecting a bond that remains very close.

Twins Matthew and Michael Youlden as infants. (Photo: Family provided).

A language evolves over time

Unlike most "twin languages," Umeri has expanded and adapted as the Youlden twins have grown. Their language now includes modern words for items like "iPad" and "Lightning cable."

Their childhood passion for languages ​​led them to study many languages, incorporating elements from each into Umeri. Although originally written in a self-made alphabet, Umeri is now rendered in the Latin alphabet for easier understanding.

Umeri's lasting impact on their lives

Karen Thorpe, a child development expert, explains that private language between twins often stems from deep personal connections, which are not unique to twins.

Despite living far apart, with Michael in Gran Canaria (an overseas archipelago of Spain) and Matthew in the Basque Country, the twins remain close through Umeri. However, they have no intention of passing it on, seeing it as a particularly intimate connection to their shared experience.