Greeley County Sheriff David Weeks says the burglary happened sometime after the Foltz family left home around noon to attend Saturday's game in Lincoln, Nebraska, and before they returned around 3 a.m. Sunday.
The thieves took items worth roughly $1,400, including a television and tools, from Jordan Foltz's home and vehicle in the Greeley, Nebraska, area.
Sam Foltz, who would have been a senior at Nebraska this fall, died in a car crash in Wisconsin in July along with former Michigan State punter Mike Sadler.
Foltz's parents presented a scholarship in his name, and two of his nephews helped lead the team out before Saturday's 43-10 win over Fresno State.
To honor Foltz, the Cornhuskers intentionally took a delay-of-game penalty in the first quarter when they sent the punting unit on the field with 10 men.
The Associated Press contributed to this report.