Sir Edgar Collins Boehm-Boteler, 2nd Bt., is usually said to have died unmarried and without issue, but there is some indication that he may have had a child:
Sir Edgar Collins Boehm-Boteler
Birth
1 Oct 1869
England
Death
22 May 1928 (aged 58)
England
Burial
St Mary Magdalene Churchyard
South Holmwood, Mole Valley District, Surrey, England
https://www.findagrave.com/memorial/61453484/edgar-collins-boehm-botelerAttached to the page is an item from the London Gazette showing that he changed his surname from "Boehm" to "Boehm-Boteler".
Also attached to the page is a tribute from "Carole Webley", saying: "To the grandfather I never met, but would have loved to. I have many photos of you and my nan (Emily Easden)."
Joseph Daiel Boehm (16 Mar 1794-15 Aug 1865); m.5 Feb 1825 Luisa Anna von Lussman --> issue, including:
1.Sir Joseph Edgar, cr Baronet 1889 (4 Jul 1834-12 Dec 1890); m.20 Jun 1860 Frances Louisa Boteler (d.22 Aug 1890); he was a sculptor, and a teacher to Princess Louise
1.1.Sir Edgar Collins BOEHM, 1918 BOEHM-BOTELER, 2nd Bt. (1 Oct 1869-22 May 1928)
1.2.Georgina Frances; m.11 Feb 1895 Benjamin Proctor Simpson Rooke
1.3.Effie Alice Josephine; m.29 Apr 1885 Conrad Herapath (d.14 Apr 1907)
1.4.Florence Louise; m.1st 16 Jul 1890 R A F Kingscote; m.2nd 8 Oct 1902 Douglas Anderson