Bryan Charles Waller intrigues me and his role in the Doyle family life makes me wonder. So every now and then I'll add another time-point document from Waller's life here as a growing blog post.
Birth of Waller in 1853
Baptisms in the Parish of Thornton in Lonsdale, Yorkshire, England
When baptized: 1853 October 2nd
Child's Christian Name: Bryan Charles son of
Parents: Nicholas and Julia Perry Waller
Abode: Masongill House
Quality, Trade or Profession: Gentleman
Registered in UK Medical Register from August 1875
UK and Ireland, Medical Registers, 1859-1943
WALLER, Bryan Charles
Masongill House, Cowan Bridge, Kirkby Lonsdale
Registered 1875, Aug 7 in Scotland
Qualifications:
Lic. R. Coll. Phys. Edin. 1875
Lic. 1875, Fell. 1879 Royal Coll. Surg. Edin.
M.B., Mast. Surg. 1876, M.D. 1878, Univ. Edin.
At Arthur's wedding in 1885
A family holiday - an interesting note in 1889. The Doyle's all together holidaying in the village of Askrigg, located at the center of Askrigg. The King's Arms Hotel at Askrigg operates today still. It appears ACD and his wife Touie are present, along with ACD's mother-in-law Emily Hawkins (who lived at Masongill also).
Craven Herald - Saturday 03 August 1889
ASKRIGG. VISITORS - At the King's Arms Hotel: ... Mr and Mrs Doyle, and MissesConstance, Adelaide, and Julia Doyle, Masongill Cottage, Kirkby Lonsdale ; Miss Emily Hawkins, Southsea ; Bryan Charles Waller, Masongill House, Kirkby Lonsdale....
Waller and Mary Doyle in 1891 census - Bryan Waller appears at Masongill in 1891 with two servants. In the next property entry Mary Foley and her daughter (Bryan) Mary J J Doyle are living at Masongill Cottage. She had been named after Waller.
Bryan C Waller, Head, 39, Single, Living on his own means ; Duly registered medical practitioner as consulting physician, born Thornton-in-Lonsdale, Yorks
Elizabeth Cregan, Servant, 38, Single, Cook domestic servant, born Yarm, Yorks
Margaret Blamire, Servant, 29, Single, Housemaid, born Whittingtonm Lancashire
Masongill Cottage
Mary J.E. Doyle, Head, 53, Married, No occupation, born Ireland
Mary J.J. Doyle, Daughter, 14, Single, born Scotland
Marriage of Waller in 1896 - Waller marred at the age of 43. What was he waiting for? Was he hopnig for marriage with someone else? Was Waller waiting for Mary Doyle to be single? If so, ACD's father Charles died in 1893 so he had a window. 
1896 Marriages in the Parish of St Andrew's and St Leonard's in the County of Fife
When, where and how married: 11th August 1896 at the Episcopal Church of St Andrew's, St Andrew's.
Bryan Charles Waller, Landed proprietor, Bachelor, age 43
Usual residence: Masongill House, Thornton-in-Lonsdale
Parents: Nicholas Waller, Landed proprietor (deceased) & Julia Perry Waller nee Parker (deceased)
Ada Roberts, spinster, aged 29
Usual residence: College Gate, St Andrew's
Parents: Alexander Roberts, Professor of Humanity, United College St Andrew's & Mary Ann Roberts nee ???
Witnesses: A.R. Roberts & M.A. Roberts (parents)
The wedding was noticed in the papers, as one might expect:
Preston Herald - Saturday 15 August 1896
WALLER-ROBERTS - August 11, at the Episcopal Church, St Andrew's N.B., by the Rev. J.G. Owen, incumbent, Bryan Charles Waller, of Masongill House, Kirkby Lonsdale, to Ada, sixth daughter of Alexander Roberts, D.D., Professor of Humanity in the University of St. Andrew's.
They had no children.
1899 - Marriage of Miss Bryan Doyle to Rev Angell. This Doyle family wedding was held at Masongill where Mary Doyle was living.
The Queen - Saturday 22 April 1899
FASHIONABLE MARRIAGES. ANGELL-DOYLE.
MISS BRYAN DOYLE, youngest sister of A. Conan Doyle, was married on Tuesday last week to the Rev. C. C. Angell, B.A., Cantab., the well-known athlete. The great popularity of the youthful bride drew a large congregation to the the fine old parish church of Thornton-in-Lonsdale, which was profusely decorated with white flowers, Easter lilies, floral arches, and other emblems of rejoicing. The service was choral, the hymns being sung by the school children. The bride wore an ivory white satin Duchesse gown trimmed with antique point de Venice lace, orange blossoms, pearls, and silver chiffon, a small coronet of the flowers among her dark hair, and a Brussels net veil. Her Court train of white brocade, which suited her tall and slender figure, was carried by her little nephew, Mastor Oscar Hornung. The three bridesmaids were very tastefully dressed in cashmere trimmed with lace and chiffon, each dress of a different colour, a soft shade of green, blue, and lavender, with picture hats of cream lace. The bride was given away by her mother, who wore a silver grey poplin costume and pale pink toque, and who afterwards entertained a large party of friends at Masongill Cottage. The newly-married pair travelled to London by the evening mail, en route for Paris, where they are passing their honeymoon.
Mrs Doyle at Masongill
Lancaster Standard and County Advertiser - Friday 07 August 1903
Perhaps it is not generally known that the mother of Sir Conan Doyle lives in the Lune Valley. She has a pretty house in the tiny hamlet of Masongill and may be often seen on a Sunday morning driving to the old church at Thornten-in-Lonsdale in a wicker pony-chaise, accompanied by her maid. Mrs. Doyle, though apparently more than the alloted three score years and ten, appears still active and robust. She always wears spectacles and, it is said, occupies a good deal of her time in revising proofs of her son's writings.
Death of Bryan Charles Waller, 1932
Yorkshire Post and Leeds Intelligencer - Tuesday 08 November 1932
WALLER - November 4, at Masongill House, Ingleton, Yorkshire, BRYAN CHARLES WALLER - Interment at St. Oswald's, Thornton-in-Lonsdale, near Ingleton, to-day (Tuesday), November 8 at 2:30 pm.
Buried in St Oswald Churchyard, Thornton-in-Lonsdale, North Yorkshire, England
In Memory of Nicholas Waller
of Masongill House
Born 29th May 1802
Died 12th March 1877
Also his wife Julia Perry Waller
Born July 13th 1813
Died May 28th 1887
Also their son Bryan Charles Waller
Born at Masongill House, July 27th 1853
And died there November 4th, 1932
Ada did not die till 1951.