I was happy to find and read about my grandfather Dr Arthur Motley here on your blog! Amazing to read and see pictures of him. He was a wonderful grandpa. He taught me 'grandpa stick it up yo jumpa' 'I dene kene but canna whackum' He would test us again & again if we remembered who invented the telephone and the raincoat. He was very generous. His daughter Annette married a Norwegian man and they moved to Sweden and adopted me, my sister and brother. Annette died 2000, 69 years old in London. She inherited all from her father but lost it all to men cheating it of her. After Annette and my father divorced she got involved with men of the lowest rank possible unfortunately for me & my sister. She had had a very unhappy upbringing though (in spite of such a wonderful grandpa in my eyes) and never found lasting love in her life due to having severe personal problems much caused by her own mother Annette, Probably why you saw so little of them. His daughter Annette was a very artistic person, she worked back stage on some theater when she met my dad. In my youth she designed clothes and painted on glass.
All the best