My father who passed away last September had been reseaching our family tree and I intend carrying this on using his records. I am work at the moment so do not have the details to hand but from memory Pasha Frost was my great grandfather's brother. He died in Constantinople in 1902 and I do have a copy of his death certificate and also a press report although the latter is a photocopy and not totally clear. I also have details of his children including his son Plevna who was born on the eve of the Battle of Plevna hence the name and subsequently drowned while bathing in the Nile.
I have never used this website before so not sure whether I will be able to scan any docs and email them to you but will try. I only came across your query when I searched under Pasha Frost to see what else I could unearth!