My mother-in-law has some military currency her deceased husband had. They are 10 and 50 SEN series 100. She is hurting financially and I am wondering what worth and if any market for them?

Japanese?
Posting a picture of it will be helpful.

Check EBay. Lots of paper money there.

Normally very little value, (if you are looking to be rich)

I see the 50SEN notes going from about 3 USD to 20 USD each. I guess it depends on how many 100's of the notes or 1000's of the notes they have.

To me, much better to frame it, along with other military memories of her late husband or you and your spouse may want your spouses fathers memories, so perhaps you help them with money?