Yes.
But maybe not at the top of the musical food chain. Most of my "modern" music experience comes from watching The Voice.
The Swon Brothers finished in third place on Season 4 and have been touring ever since.
[
www.swonbrothers.com]
Girl Named Tom won Season 21 (siblings trio) and have been touring since
[
www.girlnamedtom.com]
Usually there will be one duo or trio maybe per season, but there were several in the current season. Hard to count them at this point, they are just starting their music careers.
Maddie and Tae?
If you want pairs or trios that specialize in harmonies, not a lot of top tier groups come to mind.
Brooks and Dunn?
Aries
~Sign of the Rams