Sanford has a bad heart, a back, and crippling arthritis. Not to memtion a ***** for a son. Just think about it, without his son, Sanford would never have apologized for all of the horrilbe hate crimes he commited over the years. Like that time he tried to deport Julio.
Archie also probally many horrible medical conditions from sitting on his ass all day and bitching about minorities.
It all comes down to who wants it more, and that is up to you to decide children.