No problem war. There're lots of restaurants and some shops in T1 and T2. You only need to take free shuttle at Int'l terminal to transfer to these terminals. Since you have 2 kids, you shouldn't mind about staying there longer as also heard that there could be long line up at int'l terminal so it may take up you more time to do check in.
Check here for shops: http://www.tokyo-airport-bldg.co.jp/service_facilities/