Message:
Mordka's parents I believe to be Sura and Izrael and his siblings include Symcha, Dyna, Zurech, and Perec. I believe this to be the case because of the dates of births and shared household addresses. Mendel's parents I believe are Szmul and Chana and his sister to be Sara. I believe this is the case also because of dates of birth and shared addresses. Finally, I believe Moische's mother to be Dwora Pesa and his brother to be Izio because of dates of birth and shared addresses. All of this information I found through the jewishgen. org databases.