It is my understanding that since Marriage is a Sacrament in the Catholic Church it requires proper form, matter and intention. The proper matter would be a MAN and a WOMAN as designed by GOD. So, the Church should not allow them to get married and that is the answer you would get unequivocally before Vatican II. Now, with Francis at the helm, who the heck knows? Perhaps he’ll make some sort of exception in Church law along with communion for adulterers.
"Transsexualism" is a trojan horse deployed by modernists to attack the teachings of Christ. Their end goal is "sacramental" homosexual "marriage". The Pope deliberately arranged and publicized this meeting with the "transsexual" and "fiancee". The glaring absence of any type of rebuke of their objectively sinful lifestyle (in contrast to the harsh public harangue he recently directed toward the selfless Catholic mother) effectively conveys acceptance of their behavior.