Unfortunately, I don‘t know who the mother is…we would need to find out whether Ada had been teaching in Istanbul at some (early) stage of her life…but if she were B.‘s mum, the odd 1-year-marriage w Robert Frew might make some sense…? I just know that Bertie was born in 1899 (he was very proud that he was born in the last year of the 19th century - and also, that he had known four generations of my family: my Swedish great-grandmother „Bell“ Dickson from Göteborg, my grandmother, my mother and her sister - and me…). We wd need to find out who Bertie‘s father was, maybe there are descendants from his half siblings he MAY have had…Bertie said he was sure he had met his Father once by chance in the streets of London, when he, Bertie was a young man (17-20?). But his maybe Father just walked past him, looking hard ahead…I‘ve tried to find out who this cd have been - Yusuf Izzettin Efendi? Mehmed VI? Abdülmecid II? Abdülmecid (1868-1944) loved the Arts (and English!), he was a painter - and Bertie‘s name „Abdurahman“ might be a hint in that direction…Abdülmecid means „servant of the glorious“ (= God) and Abdurahman means „servant of the merciful“ (= God), even though it‘s Arabic not Turkish…Also, „Eastways“, where Bertie & his second wife Jean lived, was furnished exquisitely w arts and antiques…He may have been conceived at Feriye Palace…if one cd find out more about that? I seem to remember, Bertie talked about a Crown Prince…During the war, Bertie told me, he served as an interpreter and his back was hit by shrapnel at some stage, so he cd not bend over any more.