Its been a while since your post so you might already have this info..
the 1930 census shows
GANCARZ, Stanley age 36, 1st married at 28, born POLand as where his parents, laborer for a rail road, arrived in states 1910 Papers filed
Wife Victoria age 28 born Poland, as where her parents, arrived in the states about 1922
son John age 4 yrs 6 month,s
son Chester age 3 years 6 months
son Walter age 1 yr 6 months...
if this the correct family.. your father was most likly born some time after the census was taken.....Michele