Birth record from Scotland's People -- the handwriting isn't very readable:
William Sinclair Forrest
Illegitimate
June 16th (?) 1893
17 Che? Lane, Aberdeen (possibly 17 Chronicle Lane)
Mother: Williamina Burnett Ramsay Forrest (first name is poorly written in image)
Profession: Flaxmill Worker
No father's name mentioned.
Wilhelmina Burnett Ramsay ForrestBirth Date: 14 Dec 1866
Birth Place: Banchory-Ternan,Kincardine,Scotland
Father: Robert Burnett Forrest
Mother: Jane Ross
Catherine Burnett Ramsay Forrest
Birth Date: 05 Jul 1870
Birth Place: Banchory-Ternan,Kincardine,Scotland
Father: Robert Burnett Forrest
Mother: Jane Ross
1871c
William Forrest Age: 4
Estimated Birth Year: abt 1867
Relationship: Daughter
Father's Name: Robert Forrest
Mother's Name: Jane Forrest
Where born: Banchory, Kincardineshire
Registration Number: 252
Registration district: Banchory Ternan
Civil parish: Banchory Ternan
County: Kincardineshire
Address: Doeskole
Robert Forrest 49 Head
Jane Forrest 47 Wife
Robert Forrest 10 Son
Grace Forrest 6 Daughter
Katherine Forrest 11 Mo Daughter
William Ross71 Father-in-law
1881 Wilhelmina Forrest Age: 14
Relationship: Sister-in-law
Gender: Female
Where born: Banchory Ternan, Kincardine
Registration Number: 168/2
Registration district: Old Machar
Civil parish: Old Machar
County: Aberdeenshire
Address: 5 Minister Lane
Occupation: Scholar
Edward Tindall 35 Head
Jane Tindall 33 Wife
Edward C Tindall 7 Son
John R Tindall 5 Son
Mary Ann Tindall 4 Daughter
Margt L Tindall 2 Daughter
Elizabeth J Tindall 11 Mo Daughter
Edit to add this is probably her birth reg on SP
FORREST WILHELMINA BURN
F
1867
252/ 1
Banchory Ternan
His mother, Williamina Burnett Ramsay Forrest went on to marry Robert Stewart in 1899 in Aberdeen. I think this is the family in 1901, with William recorded as William Stewart:
1901
248 Holburn Street, Aberdeen
Robert Stewart, 30, mason's labourer, Aberdeen
Williamina Stewart, 32, wife, Aberdeen
William Stewart, 7, son, Aberdeen
Possible death
STEWART WILHELMINA BURN
age 64
1931
168/1 651
Aberdeen Northern District
Added - a possibility for son William’s death entry
FORREST WILLIAM SINCLAI
age 63
1957
168/1 664
Aberdeen Northern District