I have a Caroline Groombridge born approx 1830 in London/Surrey (on the 1851 census she says from Surrey. On her marriage certificate her father is stated as William Groombridge -Carpenter. She went on to marry George True in Newington Surrey in 1850 and died in 1872. Could Caroline be a sister to your William Joseph? If so is there any further information you have that couls help in my search?