You'll be pleased to know that I can see your grandfather Henry Phillip's baptism in the Kidlington PR transcript and probably those of two siblings. 1873 Dec 7 KNIBBS Henry Phillip s. Henry and Elizabeth, groom 1876 Sep 3 KNIBBS Harriet Annie d. Henry & Elizabeth, groom 1880 Feb 1 KNIBBS Rosa Georgina d. Elizabeth, widow
Harriet Annie KNIBBS went on to have an illegitimate son: 1896 Sep 6 KNIBBS Thomas Henry Axtell s. Harriett Annie KNIBBS, single woman, born 14.8.96.
Strangely, the only burial for a Henry KNIBBS at Kidlington was on 19 Dec 1878, aged 28 years. He could quite clearly be the husband of Elizabeth and father of Henry Phillip and Harriet Annie, but clearly not the father of Rosa Georgina.