I am sorry to hear about your aunt and uncle.

I dont know if you have any Sushi places in Omaha that have a track where the kids and yourself can grab from as it goes by, but this sushi place sounds inexpensive and gets good reviews...

Matsu Sushi
1009 Farnam Street
Omaha

This is the sushi place the kids and I visit quite often...

http://sushihanaus.com/