When we think about citizenship as adults, our minds tend to go to issues and voting and things like that but this lesson starts at the much more basic level of what it means to be a member of a community. All of us are part of many different communities: parish, school, state, city, teams, etc. But being part of a family is the most foundational of all communities.
The family is the original cell of social life. It is the natural society in which husband and wife are called to give themselves in love and in the gift of life. Authority, stability, and a life of relationships within the family constitute the foundations for freedom, security, and fraternity within society. The family is the community in which, from childhood, one can learn moral values, begin to honor God, and make good use of freedom. Family life is an initiation into life in society. Catechism of the Catholic Church, 2207
Really, it’s in learning the rights and duties and responsibilities of being a family member that makes the best foundation to understanding the issues that will make your children into responsible grown-up citizens (and voters) someday.
How does Jesus fit into all of this? He is the one who most wants us to live in community with one another. Our relationships here on earth are a reflection of the Holy Trinity living together in a perfect community of love, and they are leading us to someday be citizens in heaven!