The 3rd Baronet, James, laid out plans for a new town in 1770, inspired by the local plans for a New Town in Edinburgh which were by then coming into reality.[2] The rebuilding included a new church, St Mungos, in 1771, reputedly by Sir James himself.
The family are said by Anderson (1867) to date from at least 1180 AD when one of them appeared as a witness to a donation to Holyrood Abbey by William The Lion. John Scougal is known to have painted at least two portraits of the first baronets.
A number of the lineage are buried in Penicuik Old Parish Churchyard, with both a memorial gateway and a mausoleum to their memories.