Can you find real relatives on MyHeritage?

Of course, the DNA matches are reliable if they have a certain size. I could already assign matches with 6 cM (Ahnen from the middle of the 16th). However, this is a lucky case where, after a long time, enough DNA has been inherited. But I say this: Matches over 20 cM, best with several common segments, you can trust. In general, most matches over 7 cM are also correct. Wrong positive hits can occur in low areas, however. It also depends on where you tested. Thus, it can be a source of error if one has tested with different providers and the common DNA is not very large. And of course, you should also be able to consult a well-developed family tree to assign the incoming matches. If you do not even know the names and dates and places of life of his grandparents, it becomes difficult. So create a foundation first!

Generally, I strongly recommend Ancestry. Do NOT test MyHeritage, even if it is cheaper. When you test yourself at Ancestry, you can then upload your results to MyHeritage, Geneanet, FamilyTreeDNA and GedMatch and also use their databases! Otherwise, this doesn’t work, because Ancestry does not allow any extra uploads. And Ancestry is highly recommended anyway, because they have the largest database and, in my opinion, provide the most data for money by far. I mean not only the DNA database, but also very many indexed church books, state registers, other stem trees, census data from different countries, etc. For the DNA test at Ancestry you also get a 6 month test access for “Ancestry International” for just 1 EUR. I would definitely use that.

And another advice: test the oldest family members first. Maybe it can be “later” too late. If possible, test both parent parts with to easily assign the hits to the maternal or paternal line. If there is absolutely also the grandparents!

Good luck and good luck.