my grandmother's name was Franciszek
Franciszka
My father is the only son of 7 still living he is 87 and lives in London.
does your father still have Marriage cert? this might show your grandmothers maiden name.
if he is still in contact with family, they would be your best source of information, get the church
address and write to them and make donation to ask for your family line. give details so they
can match your family , because there will be duplicate surnames and given names. :)
for your grandmothers side, without the maiden name it would be hard to find anything.
you could ask your father what old documents he might have that you can look through
and pictures. maybe old letters, anything helps :)