I think its all got a bit confusing!
It has indeed. You need to start from scratch and list all the known information in order.
He married Hugh, 19 Sep 1862.
I take it that 'he' is Bridget Kerr?
The IGI lists two daughters of Hugh McIvor and Bridget Kerr
Mary, 8 October 1862 in Glasgow
Catherine, 26 November 1863 in Strathblane.
Are there any others?
I see you are using an Ancestry transcription of the 1891 census. As well as mistranscribing some names, this omits some of the information in the original. You need to use a decent transcription or better still look at the original at
www.scotlandspeople.gov.uk.
Hugh Mooney, head, 50, married, stone miner, born Ireland
Mary Mooney, wife, 28 born Glasgow
Elizabeth Mooney, daughter, 5, born Milngavie
Mary Ann Mooney, daughter, 3, ditto
Hugh Mooney, son, 6 weeks, ditto
Elizabeth McIvor, sister, 50, widow, born Ireland