Peter, when you wrote:

"Barbara died in 1861 also in Braddan but I have not found any children although they may have remained in Scotland."

does that mean that you haven't seen the 1841 and 1851 census images ? In case you haven't, here they are.

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1851
Trollaby Cottage, Marown

Alexr H Manners head 55 retired lawyer b Edinburgh / blind
Barbary wife 52 b England
Roseta daughter unm 26 retired lawyer's daughter b Edinburgh
Stuart M F son 7 b Edinburgh

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1841

Ancestry's transcription:

1841 Scotland Census
about Alexander Manners
Name: Alexander Manners
Age: 40
Estimated Birth Year: abt 1801
Gender: Male
Where born: Midlothian, Scotland

Civil parish: Edinburgh St Cuthberts
County: Midlothian
Address: 12 Saxe Coburg Place
Occupation: W S
Parish Number: 685/2
Household Members: Name Age
Alexander Manners 40
Barbara Manners 40
Thomas Manners 15
Rosetta Manners 15
Alexander Bethunes 15
Robert Bethunes 14
St Crost Miminelle 11
Janet Rae 25
Elizabeth Syme 15

All b Midlothian
Thomas Manners dentist

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Jean C