MODI’IN, Israel—Families around the world have been reunited as countries ease border controls after months of Covid restrictions. Few homecomings have been as poignant—or unexpected—as Bolek Krutz’s journey into the past.

For decades, Mr. Krutz, a retired X-ray technician from New Jersey, wondered who he really was. Click this link to find out: How DNA Tests Helped a Jewish Man Trace a Holocaust Mystery to Israel