Blanche —

You said:
If a Protestant is married twice, both in Protestant churches, we consider the second marriage invalid.

• Who considers it invalid, the Protestant denomination?

The Catholic Church would examine both marriages, because if the first one was invalid, for some reason, the second one could be valid.

You said:

• If one of the Protestants divorces, becomes a Catholic, then marries a Catholic, does this wipe the slate clean, making him free to marry in our Church?
  

If so, it seems disrespectful, not to say contradictory and confusing, to his vows from the first marriage, the one we regard as valid.

All marriages are presumed valid until shown to be invalid. The Catholic Church does not disregard the marriage vows made in other denominations, or even civil marriage vows, considering them natural marriages or sacramental marriages, depending on whether the parties were baptized.

She only presumes to decide the validity of marriages that involve her children, or those who wish to marry them.

Mary Ann