Hi Deborah, you are welcome and I'm glad this was helpful. You are now in a position to contact the family if that seems appropriate and desirable. Any children of Dorothy would be your birth aunts/uncles. The children of her siblings are your first cousins once removed.
Family can be defined and experienced in many ways. When it comes to ancestry, which is a particular facet of what our "family" is, I suspect adopted children (like your father) would look to their birth families ancestry. At least, in doing my own family tree, complete with living descendants, I have chatted with more than one adopted child and found this to be true. I'm happy that you now have a connection to those birth roots.


Mary Frances "Frannie" Isaacson obituary LINK:
http://newsandtribune.com/obituaries/x603542259/Mary-Frances...


Rosemary Dolan Dalton obituary LINK:
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=10...


T. Dugan has posted his contact information online:
http://familytreemaker.genealogy.com/users/d/u/g/Leo-T-Dugan...