>>>>>So there's this census taker visiting a house in the Boondocks. A 15-year-old comes the door. The census taker asks who lives there and the kid replies, "Now let's see - there's me, mah sister, Ma, mah uncle, mah aunt, mah granddaddy, Pa, mah great uncle and great aunt, mah cousin and second cousin and ... and ..."
>>>>>
>>>>>"So how many people live here?"
>>>>>
>>>>>"Just the fahve of us"
>>>>>
>>>>>How come?
>>>>
>>>>Come on now Terry, this is a family site.
>>>
>>>Here they are:
>>>
>>>The 15yr old kid and his sister (1+1=2)
>>>His father and mother, now divorced (1+1)=2
>>>His grandfather (father of his father), who is now married to his mother. - 1 =5
>>>
>>>So, we would have all of them.
>>
>>But how about his great uncle, great aunt, cousin and second cousin"
>
>Assuming his sister is his mother's daughter of her previous marriage, she can be married either to his father or to his grandpa at some time. Then it would be a hell of relationships... <g>

I don't think I thought it out as thoroughly as you did. You have to consider, amongst others, the possibility of his sister being, say, also his aunt - or even his grandma! :-)