Della, Tom and Another Couple

Here is a picture of my great grandmother, Della, and my great grandfather, Tom, along with another couple. This couple has appeared in several photographs over a period of time. The woman looks a great deal like Tom's twin sister, Alice, as pictured in another family photo of Tom and his siblings, but I'm not sure if it is she. Mom wrote in some notes that Alice married someone named Gassman, but I can't confirm this.

Please click on the photo itself to view a larger version of it. If you can identify them, please click on the comments link and let me know who this mystery couple is! Thanks!