Sadly don't have a birth certificate for Gertrude, going by dates working back from the census and from Edith's recollections when she was alive. Yes it is very interesting about the 1871 census, where Ada Caroline Yates ,aged 6, appears to be the daughter of Daniel Francis Hopkins & Elizabeth Hopkins? Have I read this correctly? But on Ada Caroline & Richard Ling's marriage certificate in 1890 it gives her father as William Yates. Also the Mary Hopkins, dressmaker, unmarried is given aged 30 yrs, but when she turns up on the 1901 census with Edith & Gertrude, she is given as age 56, when surely she would be 60?
I have found 2 other family trees online with this part of the Ling family mentioned, one is the Franklin family - I think in Australia. The other is the Wallis/Thurgood family They have Ada Caroline Yates's parents as Daniel Francis Hopkins & Elizabeth Hopkins (Yates), but all the related people, including Edith have the right dates. But also Ada Caroline Yates's Baptism 30th April 1865, Eldersfield, Gloucestershire, has the father's name as William Yates and & mother as Caroline ?, which would seem more likely to be right. Unless we are dealing with two different families. Gosh, my brain hurts and I am confused.