Didn't DS9 start with an explicit TNG connection? And didn't it feature recurring TNG characters in its episodes as well as two TNG characters as a part of its cast? Didn't First Contact feature an explicit connection to DS9? ... etc.
Plus, DS9 dialogue repeatedly referenced TNG ("Picard never hit me" - "I'm not Picard"; and Worf's incredible homage while talking to O'Brien, "We were like warriors from the ancient sagas. There was nothing we could not do … it will not be the same … those were good years.”)
(I'd say more about ENT and VOY ... but I'm not as familiar with them).