I have become convinced that the world, well, Wales and England at least, is a small place after chasing up siblings of ancestors, previous marriages etc because I have found so many links between people on my assorted trees. Even my mother and father were 'connected' by marriages between distant cousins. I guess the point is that the people at the time wouldn't have known and it's only the ridiculously easy access to BMD and Census records etc (compared with life before internet) that has made such discoveries possible. There is an amazing tree on Ancestry: 'Heirs of William Hares 1705' (William Hares was a lead miner in Shipham, Somerset) and Ancestry has flagged this tree so many times in my research. Quite gobsmacking... even one my Irish lot in Newport, Monmouthshire married a member who strayed over the Bristol Channel. I always say that it isn't the strength of the tie you find that matters - it's the fun you have in finding it :)