After leaving Amsterdam, my 2 daughters and I want to go to Germany, rent a car and travel for 4-5 days, then drive to Switzerland for the last 4 days. Is this something that is doable or should I plan to travel by train? We drove around France last summer and it was super easy, just a little worried as it is greater distance and we know no German. Any help would be great!!
Most people do Switzerland by train. You could rent the car for the Germany part and return it somewhere like Basel or the suburbs of Zurich, depending on your last Germany stop. Since you are doing 4 days, you are a perfect candidate for the Swiss Travel Pass, either 3 or 4 days depending on what you want to do in Switzerland. You don't say how old your daughters are - if they are 16 or under, they can ride free with you with a family card addendum to the pass. If they are 26 or younger, they get a discounted travel pass.
You can catch a train down to Cologne, and pickup a rental car there. Then drive up the Rhine River Valley going south. After you tour what you want to see in Germany, turn the car in on the east end of a huge lake in Lindau, Germany. A train will take you right into Zurich, Switzerland where you can connect to go south into the mountains.