Pray the Rosary every day for your family.
Years ago I was involved in the New Age field. I came across pretty much every type of practice and belief that field was involved in. Wiccans, those who believe themselves to be shamans, people who read tarots, played with angel cards, believed in numerology, used ruin stones, crystals, all sorts of ‘‘therapies’’ such as reiki, some people once danced around me ringing bells to clear bad energy at a mind body and soul festival. I had an old school friend who practiced psychic readings and believed in past lives and believed she could tell a person’s past life. I’ve had much to do with persons who believe they can communicate with spirits and see spirits. I’ve met people who claim to be white witches.
People such as your step dad are generally from my experience lovely people. They’ve just been seduced by a world that is very seductive. And it is a world that people can see and experience things. People can see spirits, they can talk to the dead, you can feel energy, the psychic readings might come true in part, and you might believe a particular spell worked. But it isn’t of God. The devil is capable of tricks and illusions. Goodness we have people who make a living out of being an illusionist. This is what the New Age field is. It is a big illusion and unfortunately some people get sucked into it.
Your mum is not the first Catholic woman that has re married outside of the Faith and then slowly move away. It does happen. My former atheist husband was slowly able to pull me away from the Church. But even nice people can be seductive, and influential, especially if you are in love with them. Whether they are deliberately trying to do so or not.
You just stand firm in your faith. You don’t have to defend your faith to your step father. You don’t have to get into conversations about Wicca. You don’t have to learn about Wicca nor do you have to ever feel that you are obliged in any way to listen, look, watch or participate. There is such a thing as feeling obligated. Just because your step father is a nice man who treats everyone well, doesn’t mean that you need to feel that you have to participate in any of his practices. Just stand firm. If your step dad does anymore ‘’return to me lost cat’’ spells pray the Rosary at the same time. I know you feel for your mum and your brother, but all is not lost. You have your faith. You can pray for yourself and them. You can ask others to pray for your family, such as your church prayer group. As other have said you can speak to your priest. He might know this man but your priest might not be aware your step dad is into Wicca.
Ps. There is no such thing as a White Witch or a good spell. Witch craft is witchcraft.