Mr A (Catholic) marries Miss B (Catholic) in the Church when they were very young.
One year later, they broke up without annulment. They don't have children yet.
A few years later, Mr A remarried with Miss C (non-Catholic) and has some children.
Miss B remarried with Mr D (non-Catholic) and has some children.
Both couples live happily with their new families.
Later at some point in their life, A and B look back to their first marriage and they realized that they were wrong to break up the marriage. They repend and wish to go back to Church to have communion.
What should they do now? Leave their current spouse and children to get back together?
Thank you for your opinion.