Jokdy,
So sorry, they are not Isabella's siblings at all. They are, at least one of them anyway, children of John and Isabella.
ISABELLA MORTON. Hartwood Asylum, aged 85 years, widow.
Parents - John Brownlie and Isabella Paton.
Interred in old churchyard 18th May 1907.
Also the following - wrong father but I think it could be a transcription error.
MARY BROWN. Housewife, Wishaw, aged 73 years, widow.
Parents - George Brownlie and Isabella Paton.
Interred in old churchyard 4th February 1909.
There are burial records for this Brown family. The plot was owned by William Brown and Mary Brownlie.
All dates are of internment.
In the South lair -
SUSAN B LITTLEJOHN, aged 8 months, 30th June 1896.
BEATRICE LITTLEJOHN, aged 17 months, 23rd March 1900.
In the Centre lair -
MARY BROWN, aged 73 years, 4th February 1909.
In the North lair -
WILLIAM BROWN, aged 2 years, 26th September 1898.
ROBERT BROWN, aged 4 years 9 months, 25th October 1905.
There is also a monumental inscription for this plot - The stone is (or was) an obelisk.
"Erected by William Brown and Mary Brownlie in memory of their son John Y Brown who died 15th May 1865 aged 8 years. Their daughter Mary M Brown who died 21st April 1867 aged 6 years. Their son John who died 25th September 1869 aged 1 year and their son Robert who died 19th October 1869 aged 11 years".
Lodger.