I always try to go "sideways"..........by doing this I"ve found living third cousins who had the missing link to a maternal line road block. So far I've found info on three ggg grandmothers , that were road blocks, because her sibling's ggg grandchild is looking for info about my line. I also found a relative 3 generations back, that family history said had no children....well, not true as I found him with children on a census report in another State. I kept researching the family in Wisconsin, and a living generation lives 5 miles from my brother in Colorado ! They have met and shared old photos. The family resemblance is even there. Going sideways? I recommend it !