Here is the updated list of couples in conchology. Thanks to all who added or corrected!

Peta and Mark ('ferreter') Bethke
S. T. Brooks & wife
John Q. & Rose Burch
Tom & Beatrice Burch
Glenn and Laura Burghardt
Crawford & Jean Cate
Emery and Elsie Chace
Gary and Holly Coovert
Jim and Bobbi Cordy
John & Mary D'Aiuto
Al and Bev Deynzer
Glen & Marion Deuel, Huntsville, Alabama
John Edward Gray and Maria-Emma Gray
James Hall & wife, 19th century, Albany, New York
Barbara and Ed Haviland
Jules and Carole Hertz
Kim and Linda Hutsell
Graham and Sue Jeffrey, Port Hardy, BC
Ely ("Pong") and Carlos ("Charlie") Leobrera
Bob and Betty Lipe, Florida
Gary & Margaret Mackintosh
A. Gordon Melvin and Lorna Melvin
Paula and ex-husband Paul Mikkelsen
David and Margaret Mulliner
Ida S. & Tom S. Oldroyd
Charles and Mary Owen, Chicago Shell Club
Roy & Forrest Poorman
Lovell Reeve & wife
Thomas and Lucy Say
Mary and Ed Schelling
Franz Alfred and Maria Schilder
John and Gladys Sennott
Paul and Carol Skoglund, Alabama
Herbert H. and Amelia (Daisy) Smith, Alabama
Mel Springer, wife, and daughter
Kevan and Linda Sunderland
the Van Landinghams, Outer Banks
Harold and Emily Vokes, New Orleans, Louisiana
Danny & Hiromi Yoshimoto, California

And some 'other' family groups:

Henry and Arthur Adams
Lyle and Sarah Campbell (plus sons David, Matthew, Andrew), Spartanburg, South Carolina
Peter Egerton and family
Irmgard and Helmut Nisters (mother and son), Austria
& of course the Sowerby family

Andrew K. Rindsberg
Geological Survey of Alabama