Travis Kelce may be dating the most popular woman in the world ... but he was tight-lipped with his own family when it came to Taylor Swift -- 'cause Kylie Kelce says they were all left in the dark in the early days of their relationship.
Jason Kelce's wife hopped on the "Call Her Daddy" podcast with Alex Cooper ... where she said JK's little bro made sure to keep updates regarding Swift as minimal as possible.
"It did not hit the group chat," she said.