Family Share on Apple Watch
do my kids get access to my calls and text messages with family share on an apple watch
They shouldn't. Everyone in Family Sharing has their own Apple ID and account.
M1 Mac mini, macOS 11.4; Watch, series 5 GPS/cellular, watchOS 7.5; iPad Pro 2nd Gen, iPadOS 14.6; iPad Air 2, iPadOS 14.6; iPhone 12 Pro, iOS 14.6; TV 4th Gen, tvOS 14.6 HomePods, audioOS 14.6 and Airport Express w/ Airplay 2