Archibald (often called "Archie" by Grandmary) was the best friend of William Edwards, Samantha's grandfather. He initially lived in England, and after William's death continued to visit every summer.
Samantha says he has a laugh like a happy donkey.
In The Books
Samantha Saves The Day: A Summer Story
Samantha reveals that every summer, the Admiral proposes to Grandmary, and she says no. Even so, he tries again the next year.
When Samantha, Agnes, and Agatha are stuck at Teardrop Island, he sails after them and gets badly injured. Then Samantha leads the way back to safety at Piney Point in the admiral's boat.
Archibald Beemis commissions an artist, Arthur Porterfield, to paint three pictures as a birthday present to Grandmary.