Catholic Christians are permitted to marry non-Catholic Christians if they receive a dispensation to do so from a competent authority who is usually the Catholic Christian partys local ordinary; if the proper conditions are fulfilled, such a marriage entered into is seen as valid and also, since it is a marriage

Can siblings be godparents?

Can family members be chosen as Godparents too? Yes, blood relatives and members of family can be chosen as your childs Godparents too. You can also be your own childs Godparents in the Christian faith.