Martin Helmlinger & Helmlinger Dairy.N.J

I'm trying to find any info on my grandfather Martin Helmlinger. My grandmother Teresa Sabo (this was her new married name after my grandfather died) was 6 months pregnant with my father when her husband, Martin Helmlinger, died. My father never met his dad and he as little to no info on his father's family. The only thing I do know is Martin died in May or June 1943 and he owned Helmlinger Dairy in Trenton N.J.
From what I gather, after Martin died, the dairy business was taken over by Martin's family and they disowned my grandmother..leaving her to raise her son Joe and her unborn child, my dad. If anyone has any info they could pass on it would be very much appreciated.
Tracy Helmlinger Gruner