Welcome to the forums, OP! I hope you'll find your time here edifying and interesting.
I'm an ex-Catholic, converted to Orthodoxy 11 years ago now (though last attended a Catholic mass 14 years ago). I am eternally grateful for my time spent in the Roman Catholic Church, as it was through her that I first gained an appreciation and some understanding of some of the fathers (e.g., my father of confession from that time is the one who introduced me to St. Ephrem the Syrian), and of course I have known many wonderful and faithful Catholic people. While I found over time that there were many fundamental issues with which I could not agree with the official line of the RCC (hence my eventual exit), I would never go out of my way to tarnish the Roman Catholic Church, as though its being wrong (from an Orthodox POV) is tantamount to it being evil, the 'lascivious woman' of Babylon (not sure if the filters here would allow the full phrase), or any of the other things that some people think it is. I've been in it, and was in it for quite some time, so I feel like I know pretty well that it's not all those things. There are deep, fundamental, systemic (however you want to put it) problems with some aspects of it, as I feel like many Catholics themselves can even admit without compromising their fidelity to it as a Church (e.g., in its handling of the sex abuse cases involving priests), so that in itself is not 'anti-Catholic', so much as 'pro-reality, even when it is other than how we want it to be.' All that said, I wouldn't think there's as much distance between your relatives as there might seem from any misgivings they may have about the RCC, assuming your relatives are all some type of (liturgically/spiritually) western Christian. Here it pays to remember or realize that for a very long time, the RCC was essentially the only game in town when it came to apostolic Christianity in the West (whereas there were several distinct strains of Christianity in the East, all of roughly equal apostolic vintage: the overarching Greek-Byzantine imperial Church, the bewildering array of ancient Christianities in India, the indigenous Copts in Egypt, the Apostolic Church of the Armenians, etc.). So even if some don't like to admit it, or maybe just aren't aware, most forms of Protestantism are at least at their base shaped pretty much inescapably by their historical and present relation to the 2,000 lb elephant-in-the-room of Western Roman Christianity, which is most directly represented today by the Roman Catholic Church. There are, of course, variations within even that (e.g., the Mozarabic rite in Spain, or the Bragan in Portugal), but even these follow a familiar basic pattern in a way that is not quite mirrored in the rest of the Christian world. (Indeed, all liturgies share many basics, but there is greater variation between, say, the liturgies of the Copts and those of the Armenians than there is between any two forms of traditional, liturgical Christianity originating in the West).
