TOKYO- OSAKA - KYOTO - TOKYO

Hi,

We are a family of 5 people. This will be our first time travelling to Japan as a tourist.
We will be staying in Japan for 14-days, arriving June 1 2018 then leaving Japan June 14 2018.
We will be arriving at NARITA AIRPORT via JAL 742/ JAL 741 flights.
Our hotels are booked in TOKYO, OSAKA, KYOTO then back to TOKYO.

We will be arriving TOKYO NARITA in June 1, then stay in TOKYO until June 6,
Then we will leave TOKYO on June 6 and move to OSAKA by June 6 until June 9, then from OSAKA we will move to KYOTO from June 9 to June 12, then again back to TOKYO on June 12 to June 14 before flying out back through NARITA Airport Terminal 2.

My questions are the following;

1. Is it worth getting JRPASS? and if so, what is your best suggested number of days to purchase? is it good to go for the 7-days or the 14-days? considering that the first 6-days will be around TOKYO only.

2. Next thing is, we would like to have an unlimited wifi access for the whole 14-days duration in Japan that we can immediately get upon our arrival in NARITA on June 1 at 20:00PM..., please advise, either either to get the 14-days or just the 12-days excluding the day of arrival and the day of departure.

Please provided us the detailed reply. THANK YOU