Well, we only have the claims of the parents that the son wanted to have kids. At the risk of sounding overly cynical and cold-hearted, it's definitely possible that they're doing this because they want a grandchild so that they can have something to remember their son by. It's somewhat touching and all, but still disturbing. What I want to know is, how did they actually convince a total stranger (since the article said the son was single) to agree to carry the fetus? More importantly, what if they pregnancy doesn't take? What will they do then? Just keep trying until it "works"?