Welcome srfnolen, to you and your family, home into the Church.
I was in your position when I became Catholic, too. In my case I wrote a simple, charitable letter to my former pastor explaining why I was becoming Catholic. He never responded, but one of the women pillars of the church sure did. She came to my house and demanded to know why we were leaving to become Catholic before I could even ask her inside. She was so rattled, poor lady. I think back on it now and smile, but it was rather awkward at the time.
Anyway, if you were deeply involved or had close friends, you may want to contact them to simply let them know about your family’s decision. All you have to say is what you told us–that you’ve found your home in the Catholic Church. If they are true friends they will understand and may even congratulate you. They may have questions, so be prepared for them asking questions.
Whatever you decide to do, being positive is the best approach, which is no doubt what you planned on doing. That’s all I can say except pray about it and do what you feel would be best in your situation. God bless your family this Advent and Christmas Seasons.