About Hirsch Frankel
I know that Hirsch Frankel was the father of Leo Charles and that Leo Charles married a cousin, Rebecca Frankel, daughter of Josel (Iosel) Frankel.
I have found the family of Josel Frankel
Leyba (b. c. 1770)
Tsalko (born c. 1796)
Abram (born c. 1817)
Josel (born c. 1838)
You can look for yourself at www.jewishgen.org. Type in the name Frankel in Lithuania in their search box on the homepage and then look at the various Revision Lists from the Litvak SIG, looking for FRANKEL in Merkine.