10 Day trip JR Pass dilemma

Hello, I will be visiting Japan with my family of 6. We will be here for 10 days but unsure to get the 7 days pass and pay for one way tickets or 14 days pass. Below is my Itinery:

17/12 Haneda-Nagano
18/12 (Nagano)
19/12 Nagano-Tokyo
20/12 (Tokyo)
21/12 (Tokyo) Maybe day trip to Mt Fuji
22/12 Tokyo-Osaka
23/12 (Osaka)
24/12 Osaka-Kyoto
25/12 (Kyoto)
26/12 Kyoto-Kansai

Your advise will be very much appreciated! Thank you very much!