Just to summarize (for my own benefit!) my understandings. Please tell me of errors/omissions
(I won't give spelling variations e.g. of MYERS and RHIND.)
Christopher MYERS was listed as 50 & not born in Midlothian in the 1841 census; 65 and born in Inveraray, Argyll in the 1851 census, and 76 at his death in 1858 - this gives a date of birth between about 1782 and (noting that ages were rounded down in 1841) 1787-1791.
There is a marriage of a Christopher MYERS & Marion LACHLAN in 1802 in Glasgow, and the birth of a Marion MYERS to them in 1803 Glasgow; taking the earliest dob, that would be a possible marriage for your Christopher.
Christopher MYERS m Margaret LAW (sic) 1820, St Cuthbert Edinburgh.
In the 1841 census the MYERS family was at 149 West Port, St Cuthbert as follows:
Christopher 50 Broker Born Scotland but not Midlothian
All the rest born Midlothian
Margaret 40
William 20 Labourer
Margaret 15
John 15
Elizabeth 12
{There are a few other people called MYERS in the 1841 Midlothian census - only one born Midlothian (Mary 14 a Female Servant). The rest are all born England - Elizabeth 15 Female Servant; James 20 Malster; James 25 Wheelwright & Matilda 25.}
Margaret MYERS, father Christopher, married William (sic) RHIND 1853 South Leith, Midlothian
John (sic) RHIND & Margaret MYERS had:
Margaret Low (sic) Mar 1854 b S Leith
All the rest born Leith
Elizabeth Frances Sep 1855
John Christopher Myers Sep 1857
Jane Douglas Jan 1859
William Myers Jan 1861, d 1862
William Myers Dec 1863
Agnes Georgina Sep 1867
John RHIND was the informant of the death of his father-in-law, Christopher MYERS, in 1858; no details of parents (or marriage/s?).
Margaret (MYERS) RHIND d 1898 age 73.
It would be interesting if you were to give relevant details from OPR entries/certificates which you hold - just in case anyone can spot anything else worth following up (e.g. witnesses?).
St Cuthbert Monumental Inscriptions are supposed to be at the following site but they won't load for me:
http://www.scotsfind.org/The Library catalogue on the Family Search site indicates that St Cuthbert burials to 1854 are on film - might be worth a look in case there is something for Margaret (LAWS/LOW) MYERS ...
Regards,
JAP