Mordechai Chernyak's fraternal link with Yehuda Leib (Yuda-Leyba) Chernick is likely to be invalid.
Mordechai's descendants are Levites as evidenced by the inscriptions on headstones and marriage certificates, whereas this is not the case with Yehuda Leib's descendants.
Mordechai's son Morris/Moshko only changed his family name to Chernick from Chernyak sometime after their arrival in Manchester, England. There is no record of Yehuda Leib's family ever being known as Chernyak.
@Mordechai Chernyak
