I used to use my student ID for rushes all the time back when I was in High School. Some theatres will say you have to have a "valid college or university ID" but I think they just say that because they assume high schoolers don't be doing rushes as much as college students. I never had a problem with my high school ID.
As for your second question, it depends on the show. What shows are you looking to get tickets for? Some shows limit the rush to 1 ticket per ID, while some let you get two. If they allow you to get 2 tickets per Student ID, then your dad can use one (but it's probably better if he's not with you when you buy them, so it isn't as obvious that you're buying it for someone who isn't a student).
But honestly, most rush tickets for Broadway shows these days are general rushes, meaning anybody can participate. Student rush tickets are now most commonly seen Off-Broadway.
Updated On: 8/21/18 at 01:46 PM