I'm not sure how to figure out which rail passes to purchase for our trip. I see there are a bunch of options: half fare pass, berner oberland pass, jungfrau pass, swiss travel pass. We are 2 adults and 2 children under 10. I'm hoping someone just knows the answer and can tell me what to get to save me a bunch of research :) Or perhaps is there is a website with a calculator I can use to figure this out? Below is a summary of when we'll be using public transportation.
Zurich airport to Lucerne
1.5 days in/around Lucerne including Mt. Pilatus
Lucerne to Wengen
4.5 days in/around Jungfrau region
Thank you to everyone who helps on these forums!