The Judds are being torn apart by a vicious family feud!

The ENQUIRER has learned that Wynonna and her mom Naomi are so successful on their concert tour that Wynonna is pushing her 65-year-old mom to work even harder — and that’s infuriated younger sister Ashley, say sources.

The 42-year-old movie star believes Wynonna, 46, is more concerned with keeping her career alive than with the health of their mom, who was diagnosed with hepatitis C in 1990.

“Ashley thinks Wynonna is very selfish and out for herself,” declared an insider close to the family.

“Naomi has been fundamental in Wynonna’s successful career, and she gains more attention when she has Naomi by her side. Wynonna’s latest push for her mom to do more shows has Ashley fuming.”

Get all the details in The ENQUIRER — on sale now!