Dreaming about an ex-partner, especially in a happy and fulfilling context, can evoke a mix of emotions and reflections. Here are some interpretations of your dream:

1. Nostalgia and Unresolved Feelings: The recurring dream may signify unresolved feelings or nostalgia for the past relationship. It could indicate a longing for the comfort and happiness you experienced with this person, suggesting that those feelings are still present in your subconscious.
2. Desire for Connection: Dreaming of being in a happy relationship with this ex might reflect your current desires for intimacy and connection, either with your current partner or in a more general sense. It may highlight what you value in relationships and what you seek in your life now.
3. Symbol of Comfort: The presence of this person as a source of comfort in your dreams could symbolize a need for support or stability in your current life. It might suggest that you are looking for those qualities in your present circumstances or relationships.
4. Life Changes: Since you mentioned having a family of your own, the dream might also represent your hopes and aspirations regarding family life. The children in the dream could symbolize new beginnings or the desire to nurture and care for loved ones.
5. Integration of Past and Present: Your dream could be a way for your mind to integrate past experiences with your current life. It may encourage you to reflect on how your past relationships have shaped your views on love and family today.

Reflect on these interpretations and consider how they resonate with your current feelings and situation. Ultimately, your dream may be a way for your subconscious to process emotions and experiences related to love, happiness, and family.