Important questions, thanks for asking them! You are talking about two interrelated things, 1) being on a spiritual path, and 2) talking about that path to others. Both are difficult and the second may be more difficult than the first. So let me talk about these two things in order. First, what does it mean to be on a spiritual path? I define a spiritual path in terms of the Holy Spirit. It is a path we are inspired and empowered to take by the Holy Spirit. Moreover, it is a path that helps us to achieve the fullness of our own humanity with all that characterizes that. When you approach the spiritual from this perspective, almost anything can be or become a spiritual path and that certainly includes all aspects of the spatiotemporal world.
There are a couple of things I call to mind in reminding myself of this: first, the Word of God was fully and exhaustively revealed to us in Jesus, a human being who shared fully in our spatiotemporality (that is, our historicity), even to the point of sin and godless death; Secondly, the Catholic Church is a Sacramental Church built on God's transfiguration of spatiotemporal realities. We belong to a church in which the elements of this world are sacred and capable of being transformed into symbols of eternity. Thus water becomes capable of washing us of sin, bread and wine can become the Body and Blood of Christ, oil is made capable of healing and strengthening us with the power of the Holy Spirit, and this happens not only via the grace of God but because of what these are innately.While I agree that your ministry may involve proselytization, I don't think this is the approach I would use with people I love. Our families are captive audiences, so to speak and ordinarily, it is not our job to convert them, except in one major way. We are meant to love them and to indicate who we are as Christians by our love. Remember that being Christian means being truly human in the way Christ reveals what that means. It is our vocation to become human in this way and then, if and when we are asked to do so, to express to others why we are capable of this. What Christians witness to is the God who is love-in-act and what that love makes possible in terms of wholeness, hopefulness, compassion, courage, integrity, wisdom, etc. That witness may never require us to speak the words "God" or "Jesus" or "Christ", and in some cases speaking this way may be counterproductive and even destructive. The bottom line here is if someone does not want to talk about God, or is allergic to explicit Godtalk, then use the language they are comfortable with! If you do this in love, every word will be infused with the presence of God.The notion that one person is at a lower level spiritually than we are is a judgment we human beings are not capable of making. I sometimes wonder if it is a way of seeing that even makes sense. But we are not called to judge in this way; God asks us to love others as we love ourselves; loving another means helping them to become and be the persons they are called and meant by God to be. What I am encouraging you to do is to invest your energy in becoming fully human yourself and then (in light of that commitment) invest in inviting or even summoning others to do so as well. Use the categories, activities, and interests that drive the other person in order to learn who they are, and love them to greater and greater authenticity and wholeness.
What you need to trust is that you are doing this in God's name (that is, in God's presence and power). Even when you do not use the word God or speak of Jesus explicitly, if you are loving the other you are doing the work of God in their life. If you are allowing them to love you, you are doing the same thing. You and I may be in different places spiritually, but neither of us is higher than the other. That is an idea you must really make your own if your communication and sharing with others is to be credible or compelling to them. Look for the commonalities you share with the other, the places where you can use the same language and truly share with each other at the level of your hearts. Since this is rooted in truth and love, it is rooted in God. Again, trust that.
Finally, while I love to talk about Christ and God with others, it is not usually something that happens -- even with parishioners for whom spirituality is every bit as dominant in their lives as it is in mine. Sometimes, with some folks, we never speak of God or faith explicitly. However, I don't cut them out of my life. We talk about what is going on in our lives, our struggles and joys, our challenges, successes, and failures. We do what Mary and Joseph likely did with their neighbors and relatives (including discussing and consulting about their own bewilderment at what parenting Jesus means!!).