Children

 Janet Balfore Marwick
Janet was born on December 24th, 1838 in Liverpool and her christening took place there on February 10th, 1839.^3 4 
• Birth Notes

  Name:    Janet Balfore Marwick
  Gender:    Female
  Birth Date:    24 Dec 1838
  Baptism Date:    10 Feb 1839
  Baptism Place:    Oldham Street Presbyterian,Liverpool,Lancashire,England
  Father:    Craigie Marwick
  Mother:    Isa Bolerich
  FHL Film Number:    304665
She died at the age of 1 in March 1840 in West Derby.⁵ 
• Death Notes

  Deaths Mar 1840   (>99%)
  MARWICK  Janet Balfour     W Derby  20 809
  
  


 Robert Elrick Marwick
Robert was born on January 20th, 1840 in Liverpool and his baptism took place there on February 23rd, 1840.^6 4 
• Birth Notes

  16 months old in 1841
  
  Name:    Robert Elrick Marwick
  Gender:    Male
  Birth Date:    20 Jan 1840
  Baptism Date:    23 Feb 1840
  Baptism Place:    Oldham Street Presbyterian,Liverpool,Lancashire,England
  Father:    Cragie Marwick
  FHL Film Number:    304665
He died at the age of 27 in 1867 in Malta.² 
• Death Notes

  Message in Ancestry from Gillian:
  
  Hello. I thought you would like to know about the death I have found for Robert Marwick (20.01.1840, Liverpool) whilst fooling around with Google. I always wondered what had happened to him whilst doing a Family Tree for an elderly Lea - especially after his glowing credentials on the 1861 Census. Anyway, this 1867 death in Malta appears to be correct as there were only two Robert Marwicks born within a few years of one another and the other appears with his wife on the following Census (1871), quite apart from the Death Record stating England (not Scotland). I have corresponded with the keeper of the Marwick Family Tree online and he agrees with me that this is correct.
  (remainder with links deleted).