Hiking with grandkids!

I am hiking with my two grandchildren in Switzerland in July. We will arrive in Zurich then to Wengen for 6 days then to Germany for another 8 days. Two questions:
1. Which swiss pass is best - half fare or jungfrau region pass. We will only be in the jungfrau region.
2. Which pass will take us from Wengen to Munich? Does it make sense to buy two passes - Eurail and Swiss?

Thank you - I have been researching for months and am still as confused as I when I began.
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