No, I found the Geni reference and added material from it, and organized it so that you can see exactly what you have. Notice that I also estimated a marriage date based on the birth of the children. Every little bit helps. This really is a detective game -- Geni itself is a fairly weak resource when it does not contain sourcing of its own, but to start out with, every bit helps, because then you can keep doing searches with more and more specific information. The next thing I'd suggest is you try to find Thomas Blackstone in the 1800 census. it won't gave the names of family members -- but it will tell you how many of them were at home, and also tell you whether he was still in Harford county or whether he moved. There was also a 1783 Tax Assessment in Maryland, and that may give you more information on the family.
You had asked if daughter Elizabeth married a Riley -- you really need more information on Elizabeth's family growing up before you can answer that -- at this moment if you found a marriage record for Elizabeth and a Riley, you wouldn't know if you had the right Elizabeth.