DNA does the limited things that it does very well. Autosomal DNA shows biological cousins up to 7-8-9 generations back sometimes, & FTDNA's Y-DNa shows strictly paternal lineage relatedness farther back! Do your autosomal DNA with Ancestry, FTDNA or 23&Me! My Cushing surname project at FTDNA has my & another couple guys named Cushing whose DNA results are in process; test a Cushing male w/ FTDNA!