B and D are sister and brother, as are C and K.
At only 2 years old, Y is the youngest Alphablock in the gang.
Produced by the BBC. It's was made and produced in 2010.
R is designed as a pirate to reflect the stereotypical pirate exclamation "arrrrr", while T loves tea as both the name of the letter and the drink are homophones (i.e. they sound the same).