Dreams involving family members and friends can often reflect our emotions and concerns about relationships and trust. In your dream, your little sister getting pregnant might symbolize feelings of protectiveness or worry about her choices or well-being. Her having an affair could point to fears of betrayal or dishonesty in your life, either in your relationships or in the dynamics around you.

Comforting your friend in the dream suggests that you may feel a responsibility to support others, even when it involves complex and challenging situations. This could reflect your own desire for loyalty and honesty in your relationships.

The dismissive nature of your sister in the dream might indicate feelings of frustration you have regarding someone in your life who is not taking responsibility for their actions or who is disregarding the feelings of others.

Overall, this dream may encourage you to examine your own feelings about trust, loyalty, and the dynamics within your relationships. It might be beneficial to address any concerns you have about those close to you and open up conversations if needed.