Sorry, a bit over-eager with my last response to you.I realise now that I have the birthdays of yourself (29 Aug 1964), Brother Joseph X. (10 May 1959), brother Colin J. (30 Mar 1961) but NOT that of Matthew T.And no marriages or children.
I note from the 1915 Chicago Directory, that your gradfather Joseph Xavier was living at the same address as Michael M. Gubbins and Marie C. Gubbins as 812 S. Oakley Boulevard. So perhaps that looks more like brother Michael rather than uncle?