History of the Mackenzies is incorrect.
Mary Mackenzie did not marry James Massie she married a Watkin Williams MASSIE. These were no children. There was no second marriage.
Mary and Watkin are both burried at
Holy Trinity Church
http://www.glosgen.co.uk/records/chelttrinitymi.htm
England & Wales, National Probate Calendar (Index of Wills and Administrations), 1858-1966, 1973-1995
has the following
MASSIE Mary 2 January.
The will of Mary Massie late of 23 Royal-crescent in the City of Bath Widow deceased
who died 9 December 1861 at 23 Royal-cresent aforesaid was proved at the Principal
Registry by the oaths of Sir Roderick Impey Murchison of 16 Bulgrave-square in the
Parish of St George Hanover-sqaure in the County of Middlesex Knight the Nephew and
James Watson of the Circus of the said City Doctor of Medicine two of the executors.
Colonel Robert Murray MACGREGOR was the second husband of her sister Barbare Mackenzie.