there are offices that offer these services offline. if you wanna do it on your own youll need to request a lot of acces to city archives. At least in some countrys, citys keep many infos. including if someone moves there ect.
So if you know where your grandparents used to be born, go there, and maybe you find infos about your grand grandparents. and then its just a game to hunt for infos. See if you can find your anchestors names in unis, or companys or something.
I heard its quite tedious and takes years
all those kinds of imparements are puns. like haveing a lisp. or to stutter. all speech and reading imparements are words that are hard to pronounce or read by the people affected. no idea why. just saying its the rule and no exception.