It's a boy

This is about a couple i know for a while now.They just conceived a baby boy very recently.
It so happened that, they hadn't planned for the kid, but in the event of things it so happened and the rest is history.
Now, 10 years later, if the kid somehow gets to know this or i wouldn't be surprised if my friend himself told him, how would the kid perceive this?
I had these questions meandering in my head.. would it have been the same him even if they had conceived after 5 years as they had planned. Would he have the same looks?Would he have the same character?Would he have felt happy or sad that it could have been someone else in his place?
In any case, keeping that aside, i was wondering why we don't ever care to know about our ancestors beyond our grandfathers up the hierarchy?( At least, many of us.)Ultimately, without them we wouldn't be wherever we are.People around us haven't set a commonplace standard, so we never have followed.
Talking about society and the influence of influence(yes, i typed it twice), i have loads on my head to write about it.Will do soon.