Family drama with wanting to marry first & do a ceremony later

So, my fiancé and I as Christians want to get married first next month with a small private ceremony during this immediate family reunion. We currently live together and honoring our faith is important to us. We decided partially on next month because most of his immediate family live in another country or far enough to where it wouldn’t be feasible for them to fly back next year for a wedding. Also, his dad is sick and we don’t know how much longer he will have. Plus, they support us getting married first as they’re also Christian. Now MY family on the other hand, are not. My parents were not happy with the thought of us getting married “so soon” - we’ve been together a year and a half and have known each other from before plus we are in our 30s.
which doesn’t surprise me because they were together 25 years before my dad decided he wanted to be married 🙄 & even though we want to do a formal ceremony next year anyway they’re still upset. I’ve tried explaining that marriage is about the two people in it, not everyone else outside of it and that being married is priority over the wedding itself. We invited them to December but we know next year would be a better timeframe for them to make it. We have even considered just eloping and not inviting either family so no one is offended while still planning an actual ceremony for all the wedding parts of marriage. I hope this makes sense lol.

has anyone else encountered something like this? Any advice? Be nice please! I can always clarify details if needed. Thanks!