Joseph Martin and Janet Carson lived in Dundrennan village in the parish of Rerrick.
Their four children that I know of are: Helen, Jenny, William and James.
James is of particular interest because he and his wife, Isabella Corson are the parents of Jane Martin who was married to Alexander Chisholm.
Both Joseph and Janet are named as James's parents on his death Certificate.
Janet Corson's first name is also recorded as "Jessie" or "Jenny" on different documents.
On the scotlandspeople OPR births record for William, his parents are named as "Joseph Martin or Hannay and Janet Carson"
On Joseph's death certificate his father is named as James Martin, his mother is also named but this is unreadable.
On Janet's death certificate her father is named as James Carson and her mother is named as Helen Carson (m.s. Richardson).