Nice work!
This does not add to your research into living heirs and possible claimants, but I recently compiled all I could find on this family, including many younger children omitted in many of the standard genealogical works. I post it here in case anyone is interested. (I have suppressed information about the children of Marmaduke Charles Asty, the possible heir, because I try not to post personal information about most living persons in open public forums such as this.)
If it's not too much trouble, could you post information showing the relationships among the possible 14th through 17th Baronets? I have nothing on the descendants of Walter Davis Wyvill.
Sir Marmaduke Wyvill, of Constable Burton, cr Baronet 1611 (1540-9 Jan 1618); m.Magdalen Danby, gdau of Lord Latimer
1.Christopher (ca 1562-bur 22 Jul 1614); m.Jane Stapleton
1.1.Sir Marmaduke, 2nd Bt., d.ca 1648; m.23 Dec 1611 Isabel Gascoigne
1.1.1.Sir Christopher, 3rd Bt. (bap 6 Dec 1614-bur 8 Feb 1681); m.Lady Ursula Darcy
1.1.1.1.Sir William, 4th Bt. (1645-ca 1684); m.Anne, sister of Sir John Brookes, Bt.
1.1.1.1.1.Sir Marmaduke, 5th Bt., d.2 Nov 1722; m.29 Mar 1688 Henrietta Maria Yarburgh (bap 8 Oct 1667-15 Aug 1738)
1.1.1.1.1.1.Sir Marmaduke, 6th Bt. (1692-27 Dec 1754); m.1716 Carey Coke (d.11 Jun 1734), sister of Earl of Leicester
1.1.1.1.1.2.Thomas, d.1731
1.1.1.1.1.3.Christopher, d.26 Apr 1752; m.1st 1723 Elizabeth Leake (d.19 May 1731); m.2nd 1738 Henrietta Asty (d.1742); m.3rd Anne Thayer
1.1.1.1.1.3.1.[ex 1] Elizabeth, dsp 23 Jul 1783; m.Oct 1773 Rev. Christopher Wyvill (below)
1.1.1.1.1.3.2.[ex 2] Christopher, d.young
1.1.1.1.1.3.3.Sir Marmaduke Asty, 7th Bt. (10 Sep 1740-23 Feb 1774); on his death the Baronetcy became dormant, while the estates passed to his half-sister, to her husband, and then to the issue of her husband by his next wife
1.1.1.1.1.4.Anne, d.1728; m.John Wyvill
1.1.1.1.1.5.Margaret, d.1755; m.John Purcell
1.1.1.1.1.6.Ursula; m.London Jones
1.1.1.1.1.7.Mary; m. Rev. Thomas Gee
1.1.1.1.2.Darcy, d.5 Jan 1735; m. ___
1.1.1.1.2.1.William (ca 1706-lost at sea 1750); he went to Maryland, America, married and had a son:
1.1.1.1.2.1.1.[Sir] Marmaduke, d.7 Sep 1784; probably he was entitled to succeed as 8th Baronet; he m.1st 15 Mar 1764 Harriet Rateby; m.2nd 15 Oct 1775 Susanna Burgess à 2 sons, 3 daus by 1st m., 2 sons, 6 daus by 2nd m., of whom:
1.1.1.1.2.1.1.1.[Sir] Darcy (Apr 1766- ca 1790?); m.___
1.1.1.1.2.1.1.1.1.[Sir] Robert, dsp ca 1800?
1.1.1.1.2.1.1.2.[Sir] Marmaduke, d.1808; m.___
1.1.1.1.2.1.1.2.1.Hannah Rateby (7 Mar 1807- ); m.by 1827 Robert Garraway Pindell
1.1.1.1.2.1.1.3.[Sir] Walter (4 Feb 1780-ca 1840?); m.3 Jun 1811 Anne Wood
1.1.1.1.2.1.1.3.1.[Sir] Edward Hale (14 Sep 1812- fl 1890 ); m.29 Nov 1832 Mary Davis
1.1.1.1.2.1.1.3.1.1.Walter Davis (8 May 1834- ); among his issue, if still living, the Baronetcy probably is extant
1.1.1.1.2.2.Edward, d.12 Mar 1791; m.18 Dec 1737 Christian Catherine Clifton
1.1.1.1.2.2.1.Rev. Christopher, d.8 Mar 1822; m.1st Oct 1773 Elizabeth Wyvill (dsp, see above), heiress of the Constable Burton estates, which he then transmitted to heirs by second marriage; m.2nd 9 Aug 1787 Sarah Codling
1.1.1.1.2.2.1.1.Marmaduke, of Constable Burton (14 Feb 1791-1872); m.12 Dec 1813 Rachel Milnes (d.16 Sep 1856)
1.1.1.1.2.2.1.1.1.Marmaduke, of Constable Burton (1815-23 Jun 1896); m.8 Apr 1845 Laura Ibbetson (d.4 Mar 1908)
1.1.1.1.2.2.1.1.1.1.Marmaduke D’Arcy, of Constable Burton and Denton Park (5 Mar 1849-23 Sep 1918); m.1st 12 Jun 1871 Isabella Price (d.8 Mar 1895); m.2nd 19 Mar 1898 Elizabeth Wilson-Todd (d.23 Jul 1931)
1.1.1.1.2.2.1.1.1.1.1.Marmaduke Ibbetson (8 Jun 1882-d.on active service 6 Mar 1916); m.1909 Margery May Sykes (d.1 Jul 1923)
1.1.1.1.2.2.1.1.1.1.1.1.Marmaduke Frederic, of Constable Burton (4 Feb 1912-9 Nov 1953); m.1st (div) Cissy Scott; m.2nd Apr 1943 (div 194_) May Bennet; m.3rd 30 Jun 1947 Mary Pope (d.26 May 1968)
1.1.1.1.2.2.1.1.1.1.1.1.1.Marmaduke Charles Asty, of Constable Burton (30 Aug 1945- ); m.1872 Margaret Ann Hardcastle à issue
1.1.1.1.2.2.1.1.1.1.2.Laura Louisa
1.1.1.1.2.2.1.1.1.1.3.Ethel Isabella, d.20 Apr 1959; m.7 Jun 1906 Gilbert Thompson (k.a.24 Feb 1915)
1.1.1.1.2.2.1.1.1.1.4.Edith, d.12 May 1964
1.1.1.1.2.2.1.1.1.2.Frederic Christopher (26 May 1854- )
1.1.1.1.2.2.1.1.1.3.Laura Charlotte Rachel; m.28 Nov 1877 Robert Barclay (d.3 Apr 1913)
1.1.1.1.2.2.1.1.1.4.Alice Henrietta, d.12 Dec 1892; m.10 Aug 1886 Rev. Godfrey Armytage Littledale
1.1.1.1.2.2.1.1.1.5.Edith Eugenie, d.9 Nov 1878
1.1.1.1.2.2.1.1.1.6.Maud
1.1.1.1.2.2.1.1.2.Rev. Christopher Edward (11 Apr 1820- )
1.1.1.1.2.2.1.1.3.Richard Rodes (26 Jun 1821-Aug 1879)
1.1.1.1.2.2.1.1.4.Sara Maria, d.1857
1.1.1.1.2.2.1.1.5.Henrietta Catherine, d.25 Jan 1900; m.21 Sep 1840 Robert Gurney Barclay
1.1.1.1.2.2.1.1.6.Elizabeth Jane, d.31 Mar 1906; m.19 Feb 1846 Rev. Hon. Thomas Orde-Powlett (d.12 Sep 1894)
1.1.1.1.2.2.1.1.7.Louisa Rachel, d.1832
1.1.1.1.2.2.1.2.Christopher (1792-1863)
1.1.1.1.2.2.1.3.Rev. Edward; m. Mrs Frances Dodsworth, née Pulleine
1.1.1.1.2.2.1.4.Sarah, d.25 Jun 1865; m.11 Aug 1824 Rev. Hon. Thomas John Monson (10 May 1764-3 Apr 1843),her sister’s father-in-law
1.1.1.1.2.2.1.5.Elizabeth Anne, d.21 Jan 1859; m.26 Aug 1813 Rev. John Joseph Thomas Monson (7 Jul 1791-31 Jul 1861)
1.1.1.1.2.3.Hale à issue
1.1.1.1.3.Priscilla; m. ___ Kemp
1.1.1.1.4.Ursula
1.1.1.2.Francis, d.22 Oct 1717, aged 70; m.Anne, dau of Sir William Cayley, Bt.
1.1.1.2.1.Ursula; m. Leonard Childers
1.1.1.2.2.Barbara
1.1.1.2.3.Frances
1.1.1.3.Rev. Christopher, Dean of Ripon, d.1710, aged 59; m.___
1.1.1.3.1.Christopher
1.1.1.3.2.William
1.1.1.4.Dorothy; m.Charles Tankard
1.1.1.5.Barbara; m. St.John Thompson
1.1.2.Mary; m.Arthur Beckwith (k.a.1642); parents of Sir Roger Beckwith, Bt.
1.1.3.Jane; m.Robert Wyld, of Hunton
1.1.4.Isabel; m. Hon. James Darcy
1.1.5.Grace; m.George Witham
1.1.6.Olive; m.George Meinill
1.1.7.Elizabeth; m.Sir William Dalton
1.1.8.Anne; m.Thomas Dalton
1.1.9.Dorothy
1.2.Henry
1.3.William; m.Mary Musgrave
1.3.1.Christopher; m.Frances Fetherston
1.4.Edward/Edmund
1.5.Elizabeth; m. ___ Bellingham
1.6.Olive; m. Cuthbert Collingwood
1.7.Mary; m.1st John Wylde, of Hunton; m.2nd Anthony Bulmer
1.8.Katharina; m.John Wharton
1.9.Philippa; m.Richard Sale
2.Marmaduke; m.1st Judith Morley; m.2nd Judith Braby
3.Thomas
4.Humphrey
5.Rev. Francis, d.1649; m.Helen Norton
5.1.Thomas; m.Mary Place
5.1.1.Mary; m. G Thornhill
5.2.Edward; m.1st Elizabeth Pierson; m.2nd Elizabeth Norton
5.2.1.[ex 1] Edward
5.2.2.[ex 2] Francis
5.3.Rowland, dsp
6.Robert
7.William
8.John
9.Elizabeth; m.Christopher Phillipson
10.Maria; m.1st Francis Briggs; m.2nd Thomas Percehay