...or more precisely, who were your Grand-parents?
If you know the name of your Grand-parent, place of birth and year, you can obtain a copy of their birth certificate after searching for it
here. And
never overlook variant spellings!
While a Birth cert is certain to provide you with cool stuff like the occupations of the child's parents. it could also open a can of worms - so beware!
Once you have your Granddad's birth cert, it shouldn't be too difficult to work your way back up the tree to 1837, when civil registration was first introduced. Just don't come crying to me if your name is 'Smith'.
I'm stuck at 1735. Any help would be appreciated.