Saw that too, Wikipedia had a note regarding the familial connection added to Jen's Wikipedia page the other day when the rumor stirred up and now it's gone already.

The sauce was her grandma's obit from a couple years ago which had no mention of a Jeff or Jeffery in her line, meaning Jeff Psaki would not be brother, cousin, dad, or uncle of commie Jen. Still could be a more distant relative, but sauce remains to be seen.