yes but Pre-Check is a separate program from Global Entry. I've read that Global Entry doesnt get the rest of your family in while Pre-Check will. we'll see come Monday.
Wherever you read that was wrong. Pre Check does not guarantee your family will get TSA-PRE (unless your family is all 12 years or younger). However it is likely that everyone on the same PNR will get "TSA-PRE" if one person has it, regardless of whether they got it via Global Entry, Sentri or TSA-Precheck. I got my Precheck through Global Entry and my mother got TSA-PRE on her BP when we flew to Sweden. If you don't see it and the airline participates double check that its been added to your flight reservation (which is different than being added to your frequent flier profile). If its not there you can enter it in and re-print your boarding pass so it says TSA-PRE on it. That said participating in the Pre-check program does not guarantee you will get it listed on your boarding pass. Occasionally the TSA-Precheck system decides you need to go through the regular line and some airlines don't participate in the program.
Here is one of many threads on flyertalk about this and, while 75-80% are successful when people are on the same reservation it doesn't work every time
https://www.flyertalk.com/forum/tru...-traveling-non-precheck-friends-family-8.html