My heart is with you Therese but my head needs more! As the old Russian proverb says 'trust but verify'.
I have discovered there is a B.V. Raman Association and I intend to write to them. However, if you stumble of any of those books you mentioned by B.V. Raman's grandfather do let me know what you find out!
I do wonder if B.V. Raman exclusively used this house system? I found this piece by Robert Hand mentioning that his first experience of whole sign houses was from a lecture by B.V. Raman. This quote comes from a much longer post by Robert Hand on Facebook on whole sign houses: