I've just begun the research, my sister Jan has some background, I will include it as I go.
The Plummers just celebrated Thanksgiving 99 at Bob and Linda Plummer's residence in St. Louis, Mo, and then at Terry and Beth (Plummer) Orf's residence in Columbia, Mo. In attendance at the Plummer residence 11/25/99 were Bob and Linda Plummer (Linda is step mother to Bob's Children),Bob(widower of Opal Plummer, deceased) is father of: Jan Hojnowski (Plummer) and her son Phillip, Jeff Plummer and his son Jeffrey Kyle (My daughter, Melissa Faye, did not make this trip), and Russ Plummer and his son Austin. At Terry and Beth (Plummer) Orf's, 11/26/99, all the above were in attendance plus the youngest Plummer sibling Beth, her husband Terry Orf, and their 3 children; Katie, Nick, and Matthew.
A great time of dining, fellowship and outdoors activities such as hiking and cave exploring at nearby Rock Bridge were enjoyed by all.