I am looking for more information about my great-grandfather WILLIAM JOHN LEWIS.

He was born in Maesteg (possibly Llangeinor nearby) in 1881.
He died in Penlligaer in 1960.
In 1911, he lived in Treorchy (16 Barrat St.)
By the time my grandfather STANLEY JOSEPH LEWIS was born in 1913, WLLM JOHN lived in Grovesned, in Lliw Cottage.

He was married to Mary Ann PRICE, and it is possible that the small holding was hers (Lliw Cottage)

Despite knowing all this for certain through both records and family knowledge, I am struggling to find WLLM JOHN LEWIS's father.

Another Lewis in South Wales...

Any advice?

He always went by William John.