No
It depends on what kind of parish. If he is Catholic, then no, he can not marry because he is already "married" to mother church. However, if he is an Ipiscable priest and is married, but deciedes to become Catholic, then he may be a married Catholic priest.
Yes, if he had been married and had been a priest in a similar religion - Orthodox or Anglican. He may keep his wife when he becomes a Catholic priest. A Catholic man who is a widower can also become a priest but may not remarry.
In theory, any Catholic male can be elected pope. In practice, the election is usually done among the cardinals, and I suspect it's fairly unlikely that a married priest - who would be sort of an outsider within the Catholic community - becomes either a cardinal or a pope.
No, in order to become a Cardinal you need to be priest or bishop
You can but your behavior is contrary to Catholic moral rules. Ask your priest--I am not a Catholic authority.
In the Roman Catholic Church, it is required that a priest be celibate. This is to keep the priest from being distracted from doing God's will as a priest. However, if an Anglican or Orthodox priest who is married converts to Catholicism he is able to become a Catholic priest and keep his wife. In the Eastern Catholic Church though, the priests are allowed to marry though. Lutheran and Episcopalian Priests are allowed to marry as well.
There are many priests who got married. Martin Luther is one of the most well known priest who got married.
Yes, in some rare cases. If a married priest from another religion, such as Orthodox or Anglican, converts to Catholicism and decides to become a Catholic priest, he can remain 'married with children.' A Catholic who becomes a widower is also free to become a priest but would probably be advised to wait until any dependents are grown and on their own. There have been a few very rare cases where a priest has been allowed to adopt a child.
no
St. Patrick was a Catholic priest and bishop. He did not get married.
In short, yes.
No, Roman Catholics are required to be married in a Catholic Church, by a Catholic priest.