Thy mother - Judah or Jerusalem. Jehoiachin is still addressed.
In thy blood - Blood is equivalent to “life” Genesis 9:4. The clause is equivalent to “Thy mother is a vine, living in thy blood,” i. e., in the life of thee and of thy children. The excellency of a vine is in her fruitful branches; the glory of a mother in her noble children. Jeremiah was to write Jehoiachin childless (see the note at Jeremiah 22:30); Ezekiel here takes a general view of the king and princes of the blood royal.