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Thomas Rhett and his dad Rhett Akins are once again combining their talents -- this time to help others. 

Country Weekly says the father and son singer-songwriters recently raised $40,000 to help those with cystic fibrosis.  The two country stars teamed up earlier this month in their hometown of Valdosta, Georgia for the special show for Great Strides Valdosta, which is raising awareness and providing support to those with the condition. 

Thomas says he and his dad had a couple of reasons for helping out.  He explains that in addition to cystic fibrosis being "a terrible disease," he has a cousin who's been diagnosed with the illness. 

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