PLAINFIELD, Ill. -- Despite weeks of investigation, Plainfield police are struggling to solve the disappearence of Lisa Stebic.

Video: Stebic Sisters Hold Out Hope

Now a month into the investigation, Stebic's sisters say they are grateful for all the support they've received and they still hold out hope that Lisa will be found alive.

"We would just like to say thank you to all of the people that have helped us out and that are thinking of us, because we couldn't do it without you," said a tearful Jamie Bouma.

Stebic's sisters say they have seen their niece and nephew, Lisa's children, often. Craig Stebic and his children spent the Memorial Day weekend in Michigan's Upper Peninsula.