Is it likely that marriages and baptism would be recorded in Free church records
No, because the Free Church did no come into existence until 1843.
It is possible that they might have been baptised and/or married in a dissenting or episcopalian church, and that records were kept, and that those records have survived, but it isn't very likely. You can find out which non-Church of Scotland registers are in the National Archives of Scotland
www.nas.gov.uk by searching the online catalogue for documents whose reference starts with CH3 (CH2 is the Church of Scotland records).
Episcopalian records, if any, are unlikely to be in the NAS. If they exist, they are more likely to be somewhere in the diocese. You could have a look in the Scottish Archive Network
www.scan.org.uk just in case.
The more likely situation is that the records you are looking for did not survive, but you never know, you just might be lucky.
