Osaka Nara Tokyo

Hi. My family of 3 adults and 1 six year old. Will arrive at Kansai International then make my way to the Dotonbori area where we will stay for 4 nights. On one of the days, we will travel to Nara Park to see the deers. One the fifth day, we will head to Tokyo where we will stay for 6 nights. We may travel out of Tokyo but just its surrounding areas like Shibuya, Shinjukku and Akihabara. In your opinion, is it worth getting the JR Pass? Thank you.