They're homosexuals for one. They used a surrogate mother for two. They want to adopt a child into a disordered relationship for three. All of these actions are disordered and intrinsically evil.
Basically, their lives are a mess. And their children's lives will be a mess.
I don't know whether they're sinners or not, since their guilt depends upon their understanding of the nature of their actions. Nevertheless, it is the resposibility of the rest of society to prevent such adoptions.
I rather think that brother Aquinas would prefer the maxim of doing nothing, if such confusion exists. That is the first principle when considering the typical abortion. If you do nothing, what is the result? The result is a baby. A human being.
Primun non nocere. First, do no harm.
These guys are selfish. They could have adopted any number of disabled, unfortunate, unwanted children, but no, they have to be showboats for the gay cause, no matter what they say about not wanting publicity. You don't give high-profile interviews with newspapers if you're not after publicity.
It's all about them, don't doubt it...