This person cannot be the sister of Henry John Mesenbrink, since they were born 150 days apart (and their birth dates are well attested). Since the mother, Maria Dorothea, was buried in the same place as Henry John, it is almost certain that he is correctly identified as her child. That means this profile has incorrectly identified parents as John Heinrich and Maria Dorothea.
Does anyone have any original records proving either a different birth date for one of these two siblings, or otherwise proving who her parents are?