Hi, took a quick look and yes, Duncan MacIntyre's parents were Lauchlin and Katie MacIntyre. I was not able to verify that Katie's last name was MacDonald. The 1971 census shows Lauchlin as being widowed with the following children: Annie, Catherine, Isabella, Flora, Catherine Mary and Duncan A. It looks like he may have remarried in 1871 to a Mary MacColl -- parents listed as Duncan and Ann MacIntyre. You can explore this info further at www.novascotiagenealogy.com
Hope this helps a bit!!