Hello Valeria, Thanks for the reply to my query. I had done a relationship calculation with Family Tree Maker and it said that the girls of this later marriage were my 2nd great grand Aunts, but I felt this was not quite right. So should they be my HALF 2nd great grand aunts, my 2nd HALF great grand aunts or my 2nd great grand HALF aunts? It's kinda confusing. Barry Howard, Vic. Australia. On 8/09/2011 11:23 PM, Valeria Greenwood wrote: > Hello Barry, > Yes, you are correct--they would be "half"--same father, different mother. > I have many half cousins from my grandfather's first marriage. > > You say you are descended from the 2nd child by his first marriage. > Whatever relationship you have determined for the sibling of your ancestor, > then the children by the 2nd marriage would be the same--only just add > "half" to the relationship, i.e. half third cousin, etc. Clear as mud?? > > Valeria Greenwood > Nova Scotia