Brad Verity on 16th Apr 2007 has produced a pedigree of descents from Joan Beaufort which shows that Ninian m. Dorothy, dau. of Sir Wm Gascoigne and Margeret Percy, which is confirmed in Glover’s visitation of York in 1584-5:

Joan Beaufort, Countess of Westmorland (c.1379-1440) had two sons (D1
& E1) and 2 daus (A1 & C1).

A1) Mary Ferrers, Lady Neville of Oversley (1394-1458), had
A2) John Neville of Oversley (d. 1482), who had
A3) Joan Neville m. Sir William Gascoigne (d. 1463), and had
A4) Sir William Gascoigne (c.1450-1487) m. Margaret Percy (see C3
below), and had (with B5 below),
A5) Elizabeth Gascoigne (d. 1559) m. by 1493 George Tailboys, 9th Lord
Kyme (c.1467-1538), and had
A6) Cecily Tailboys m. 1) William Ingleby of Ripley, and had
A7) Sir William Ingleby of Ripley (1518-1578) m. Anne Mallory (d.
1588), and had
A8) Katherine Ingleby m. c.1565 Sir William Arthington of Arthington
(d. 1586), and had
A9) Cyril Arthington of Arthington (d. 1608) m. Rosamond Hawksworth,
and had
A10) William Arthington of Arthington (d. 1623) m. 1608 Anne Tancred,
and had
A11) Henry Arthington of Arthington (1616-1671) m. 1638 Mary Fairfax
(see B10 below), and had
A12) Mary Arthington (1648-1711) m. Thomas Worsley of Hovingham Hall
(d. 1715)

B5) Dorothy Gascoigne (c.1485-c.1520) m. c.1500 Sir Ninian Markenfield
of Markenfield Hall (d. 1528), and had
B6) Eleanor Markenfield (c.1510/15-by 1535) m. Robert Aske of Aughton
(d. 1542, descended from Edward III but not thru Joan Beaufort), and
had
B7) Robert Aske of Aughton m. Elizabeth Dawnay (see E5 below), and had
B8) Ellen Aske (c.1565-1620) m. 1582 Thomas, 1st Lord Fairfax of
Cameron (1560-1640), and had
B9) Ferdinando, 2nd Lord Fairfax of Cameron (1584-1648) m. 1) 1607
Mary Sheffield (see D8 below), and had
B10) Mary Fairfax (1616-1678) m. 1638 Henry Arthington of Arthington
(see A11 above)

C1) Eleanor Nevill, Countess of Northumberland (d. 1473), who had
C2) Henry Percy, 3rd Earl of Northumberland (1421-1461), who had
C3) Margaret Percy m. Sir William Gascoigne (see A4 above)

D1) Richard Nevill, Earl of Salisbury (1400-1460), who had
D2) Eleanor Nevill m. 1454 Thomas Stanley, 1st Earl of Derby (d.
1504), and had
D3) George Stanley, Lord Strange (c.1460-1503) m. Joan Strange (d.
1514), and had
D4) Jane Stanley (c.1485-152-) m. Sir Robert Sheffield of Butterwick,
Lincs. (d. 1531), and had
D5) Edmund Sheffield, 1st Lord Sheffield (1521-1549) m. c.1537 Anne
Vere (d. 1572), and had
D6) John Sheffield, 2nd Lord Sheffield (c.1538-1568) m. c.1562 Douglas
Howard (c.1535-1608), and had
D7) Edmund Sheffield, 1st Earl of Mulgrave (1565-1646) m. 1) c.1581
Ursula Tyrwhitt (d. 1617), and had
D8) Mary Sheffield (d. 1619) m. 1607 Ferdinando, 2nd Lord Fairfax of
Cameron (see B9 above)

E1) George Nevill, 1st Lord Latimer (c.1411-1469), who had
E2) Sir Henry Nevill (d. 1469), who had
E3) Richard Nevill, 2nd Lord Latimer (1468-1530), who had
E4) Dorothy Nevill (1496-1532) m. Sir John Dawnay of Sessay (d. 1553),
and had
E5) Elizabeth Dawnay m. Robert Aske of Aughton (see B7 above)