Disney does not own Warner Bros. or Lionsgate. Warner Bros. is owned by AT&T, as part of its WarnerMedia division. Lionsgate is an independently owned film studio and entertainment company. 20th Century Fox was acquired by Disney in 2024 and renamed 20th Century Studios.
No. There hasn't been any Warners with ownership in the studio since 1967, when Seven Arts bought the studio from Jack Warner. Over the decades, Warner Bros changed ownership many times. In 1969, Warner Bros-Seven Arts got bought by Kinney Parking Services becoming Kinney National.