Not very good with these computers,and can't see how to reply other than come here.
    How fascinating that you knew Uncle Jack and had a close relationship him,and met up with Margaret's family in America. According to the 1901 census,there were other siblings too,that my dad didn't mention to me.
   
       Harry,b1885
       Robert,b1892
       Frank,b1894
       John,b1897
       Margaret,b1898
       Lilly,b1900
       Alex,b 1904
       Stewart,b1906
     I see your dad there - did you know the other uncles and aunts too?
                    OK this is how the connection you wanted to know about fits into your tree.
       Going back past Robert Neilson Steel's parents,John Steel and Jane Owens,his mother was Mary Neilson,daughter of John Neilson who was the brother of James Beaumont Neilson. John Neilson was in my opinion equally as important a man,and has an interesting history too,and was very wealthy.Worth a look!