::You have some flaws. When 2 Brahmans marry it is neither anuloma or pratiloma. You are right when you say that many of DN Tagore's other sons had non Pirali brides. This is also there in Sivnath Sastri's Histry book on Brahmo Samaj 1st ed. at P.127 "... late Babu Haradev Chatterji father in law of two of Debendranath's sons ...". Chatterji is one of the 4 highest castes of Bengali Brahmins and definitely not Pirali. The difficulty in arranging Rabindranath's marriage was his associating with beef eaters and his loose early life. Both Dwarakanath and Ram Mohan Roy had the same problem and used to employ 2 sets of cooks (Muslim and Hindu) which upset all the womenfolk in their houses.