The only thing better than starring on a TV show with music legend Gladys Knight ... is getting singing lessons from her.
Knight -- who co-stars on "The First Family" as the President's mom -- was filming a scene with her TV "grandchildren", which required them to sing ... on key. But the youngins couldn't hit the notes.
In the video ... Knight gave her young pips -- Khylin Rhambo, Yara Shahidi, Sayeed Shahidi, and Layla Crawford -- a crash course in singing, with a little tune called "This Little Light Of Mine."
It totally paid off (duh it's Gladys) ... because the kids nailed it the very next try.
Takes 'First Family' Kids
To Singing School
10/28/2012 4:35 AM PDT BY TMZ STAFF
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