Welcome to Grace Centered Christbearer.
My family is protestant, as am I, but I married into Catholicism, in a Catholic church. That said, I do disagree with some Catholic doctrine, but some "protestant" doctrine also, I suppose. I do not consider the Catholic church to be the one true church, the true church is a body of Christians in a relationship with Christ, regardless of denominational preferences. Together we are one.
I attend services and am a part of the Church of God, Anderson, Indiana. Although we are about as far from Catholic formalities as a "denomination" can be we have a very close relationship with the Catholic church next door. We are blessed by embracing our common purpose and serving one another, as well as the community at large, together.
I am pleased to call a Catholic "brother" hoping this sentiment reciprocal.