Yes you could. If you were a parent you would do it without blinking.
You know what bugs me? People who think they know what someone else would do. They don't; the fact of the matter is, parental love motivates a lot of different, sometimes conflicting, behaviors in people. Parents do not all react the same way to the same circumstances just because they are parents.
And no, I would not "do it without blinking." If I had a son, I rather think he would be ashamed of me if I were to kill an innocent person to create a copy of him -- not resurrect him; create a copy
, a separate, different person
who happens to merely possess his traits. To commit such a murder would be to profoundly dishonor his memory.