The mysteries of one's past

 Instead of working hard on my new story (which already has 8 thousand plus words written) I have been side lined into checking my family tree these last few days.

I've started this before but this time I stuck in and checked the four grandparents back as far as I can, and astonishingly, one tracks back to 1485. The most astonishing thing is that it is the string I thought least likely to go anywhere. 

I'm always wary of these people who claim to be descended from some historical figure way back in the 12th century, so I've double checked forward and backwards (so that grandparent, parent and child match each other.) Apart from that I don't know how to prove the links. Any ideas would be welcome. The lady on the right, in the smart hat, is Mary Weston, my maternal grandmother. If anyone recognises the children in the two pictures below, do let me know as I haven't a clue who they are!