Hi Mitesh -
<<"I agree with you being on a holiday I would like to keep the stress behind and travel at a leisurely pace and specially with children it's not possible to take the early morning trains.">>
Certainly. I completely agree with you and Alan. You'll note that I did not recommend it. ;-).
In fact, it has been many years since I was willing to get up to catch an early train. Probably, if you did take an early one, you would fall asleep on the train and miss some very nice scenery between Luzern and the Interlaken area..
My main point was for you to learn to make use of the timetable. Please read about it in the My Swiss Alps link....
In it, there is a tremendous amount of useful information about travel in Switzerland. The timetable defaults to the fastest route, so sometimes you have to enter an intermediate point on the slower, scenic routes to force the timetable to display them.
This map will help you visualize the parts of your journey(s) that are in Switzerland:
Under the menu item "Points of Interest/ Traffic" you can force the map to display the stations for public transport. You will wish to zoom in when you do that, or else the map will be invisible beneath a multitude of blue spots. ;-)
Also, if you zoom in, you can see the rail lines.
The timetable will get you from Interlaken (or nearby) to Paris, also. The trains at xx30 from Interlaken Ost have only one change of train, at Basel. If you expand the journeys by clicking on the "+" sign to the left of a journey, you will get the list of train changes, and the times allowed. At Basel, you will have 5 minutes.
That seems like it might be difficult....but the trains routinely enter Basel on track #6 and depart on track #5. Those are on two sides of the same platform. Even with luggage, that time is possible.
You can see that on a station map. The SBB website has so-called "Trafimage" plans of major stations. Here is Basel.
plans.trafimage.ch/bas el-sbb?lang=en&WT.ac=textimag eteaser-trafimage-basel#?layer=basel_innenplan& x=611397&y=266318&r=0. 13
Also, if you expand a journey in the timetable by clicking on the "+" you can access a map of the route by looking in the footnotes that appear.
Where to stay near Interlaken:
Interlaken Ost is the major connection point for trains between the Jungfrau region and the rest of the world.
Interlaken has few tourist attractions of its own. If you plan muliple journeys with a town in the rgion as a base, Interlaken is a good choice.
However, for a real feeling of the Swiss Alps, it is better to stay south of Interlaken in one of the key mountain towns -
Lauterbrunnen (in the Valley), or Wengen, Grindelwald, or Mürren - which are higher, and/or have better views.
Look at -
If you are interested in details, this report will give you lots of them:
You are arriving at the start of the busy summer season.