WALES international Aaron Shingler has signed a new deal with the Scarlets, while brother Steve is returning to Llanelli from London Irish.
The Hendy brothers will be back in harness at Parc y Scarlets next season with both having penned three-year contracts.
Aaron has emerged as one of the most consistent performers for the West Wales region this season, while Steve is heading back west after two seasons at the Madejski Stadium.
"It's important for our progression to have secured these two talented players from our region who will add real value to our squad going forward," said Scarlets head coach Simon Easterby
"Steven will fit into our Scarlets system very well as he's grown up in our region — he's a versatile and ambitious player who has broadened his horizons and benefited from the two seasons with London Irish.
"Aaron is a committed professional, his career is on the rise and it's been good to see his quick progress at international level as well as with us at Parc y Scarlets.
"He's a strong, athletic and intelligent player and will be an important to us as a senior figure in our pack as he gains more experience at the top level of the game."