For a long time they were a stumbling-block to me until I remembered a very significant fact: that she and Alfred Inglethorp were cousins. 
I recollected that she and Alfred Inglethorp are relatives 
mnli hypothesis: I recollected that she and Alfred Inglethorp are relatives  premise: For a long time they were a stumbling-block to me until I remembered a very significant fact: that she and Alfred Inglethorp were cousins. 