I have done a little work, mainly cleaning up work done by a cousin of mine, so I guess you could call it a collaboration of sorts.
I have ancestors (or their siblings)on my paternal grandmother's side who owned plantations in Jamaica and Bermuda and made a fortune when slave owners were compensated upon abolition. I have a lot of questions for them. I do judge them by today's standards because obviously there were people campaigning for abolition while they carried on with the evil.
These ancestors were English and I have traced records to Lincolnshire and Bath. There is another strand on my grandmother's side from Norfolk, near Scunthorpe. Not sure how much affinity I might feel for Scunthorpe, but maybe one day I will go and see if the hair on the back of my neck stands up.
On the Irish side of my grandmother's family were Normans, the barons of two south eastern Ireland baronies. The history of this side in Ireland is known from about 1100. I have seen the ruins of one castle they owned and another was owned by a singer back in the 80s and still lived in.
Granny was herself born in South America and I have seen census records of her family. Funny to see people I knew of as 'Joseph' or 'Mary' recorded as Jose or Maria. Granny and two sisters were sent to Ireland at a young age after their oldest sister eloped with someone unsuitable. The wife of either a brother or an uncle of Granny's wrote a book about her life that is part fiction, part autobiography. She comes across as unhinged and completely lacking in insight into her emotions and motivations but it's an interesting read with details of estancia life at the end of the 19th century thrown in (it's out of print but available from the Library of Congress). I have tracked (stalked?) many descendants of Granny's brothers all over South and Central America via Facebook friend lists but have not made contact. Their surname is not Spanish, obv, and is unusual in England too.
I have a third cousin who has devoted a few decades to all the strands of this family's history but he is very weird about sharing it.
I am going to do a DNA test because on my mum's side there are many relatives with very south east Asian features.