I don’t know. Would like to know the answer, though, as our daughter has been dating a non-Catholic lately and they seem somewhat serious at times.
My mother’s father and my father’s mother were both Irish Catholics, who married non-Catholics. My father’s father was from a Huguenot strain and a member of the Dutch Reformed Church, and vehemently anti-Catholic. My mother’s mother was nominally Anglican, a Mayflower descendant and more or less indifferent to religion and mildly dismissive of Romanism. Neither my father nor my mother were raised in religous households, though both joined the Catholic Church when I was about seven. Prior to that, we attended a local Protestant Church. Protestant Sunday School was much more pleasant than Catholic catechism class.
In all the cases the Church hold is that the Sacrament of marriage is true, but on the one side -- i.e. the Catholic half. If your daughter marries a non-Catholic, then she truly receives the sacrament of Matrimony including the responsibilities. He, on the other hand, also receives it, but as he is not Catholic, he will not be held under it
The marriage is still valid
We are in the same boat and are concerned about our daughter. We are hoping we can get her to talk to a priest about this so she is aware of what she may be getting into.