Yes, he can officiate at a wedding. However, unless it is a very special occasion it is unlikely he would do so,
"Since her uncle was an ordained minister, she asked him to officiate at her wedding."
In some states, anyone can officiate at a wedding, even a congressman. In other states, you must be a member of the clergy to officiate.
He was an absolute monarch
Pope Francis is pope number 266.
Since Pope Francis is the first and only pope by that name, there is no need for a number after his name. If a pope in the future also decides to take the name Francis, he will become Pope Francis II and then the original Pope Francis will become Pope Francis I.
Pope Francis is the reigning pope in 2013.
Only Pope Francis and God know what Pope Francis thinks.
No, Pope Francis does not smoke.
Pope Francis I is from Buenos Aires, Argentina.
Pope Francis has not been succeeded at the time of this answer.
Pope Francis was elected pope in the Sistine Chapel.
The current Pope Francis is from Argentina.