In this case we have a mom who wants to replace a dead son, and have some one give girth to his children for her to raise. The son didn't leave a will or any paper work asking for this, its all the moms idea. We don't know what his wishes were and frankly neither did his mom. There are ethical issues involved here. Just because its her son, what gives her the right to do this??? Hell she might have even broken the law by donating his body parts, he certainly never authorized that.
What if after you died one of your kids said, fuck I miss my mom, and they got some of your DNA and had the doctors make up a fertile egg for some one to carry, is that right or wrong ?? just because we can do it doesnt mean we should.