i have some information for you. Mary Susan Mann and Samuel Allen were actually the grandparents of Mary Susan Allen.Her father was Andrew D. Allen and mother Sarah Harriet Diffee. it would be strange if these are different people because in my records Mary Susan Allen was born August 1, 1869 in Arkansas and died on October 20, 1959 in Arkansas. I think the names here are way too similar for them not to be the same people... however there are Allens in Texas and I have no record of her being married to a David Howell but to a George B. Lewis. This is strange. Let me know if you have any clarification.