Berlin is to great if you don`t know in which "Stadtteil"
they are born or married.
But for your familymember Friedrich Hailer look at
Wikipedia, Edelfingen remains since the 70th to the town
Bad Mergentheim. Search the archiv from Bad Mergentheim, they can help you with the birthrecords. Are they catholic
or protestants? Important at this time - churchbooks -!
Good luck.