Hello, and welcome
The best thing to do is list what you know, and what exactly you want. By the way, have you tried 
www.scotlandspeople.gov.uk ? You have to pay, but you can get so much information, especially through birth, marriage and death certificates, that it's a worthwhile visit!
I looked on ancestry (which doesn't show the Scottish census images, so we have to deal with transcriptions) and there's a possible sighting of the family in 1871 - that is if Richard is a shoemaker. They've been transcribed as MARGARET, but that could have been read as Margt, which I could persuade myself could have been bad handwriting of McGirle 

6 Hamilton St, Greenock
Richard  Margaret Head 54 Shoemaker Ireland
Ann             "        Wife   51                    Ireland
Maria           "        Daur  22                    Ireland
AMELIA        "        Daur  15                    Ireland
Samuel        "        Son    13                    Greenock
John <no last name> Son-in-law Labourer Ayrshire
Mary Janet  <no last name> Boarder                  Ireland
McCrnest               Son  11  Greenock
Albert McCrnest     Daur 5       " (Yes, it really does say daughter!!)
Elizabeth "             Servant 24   Ireland
Ellen        "             Daur      19   Greenock
Jane        "             Daur      10        "
I would say that this is definitely a census transcription that needs to be checked against the image!!
Do any of these names strike a chord?
Isobel