Dreaming about discovering infidelity, especially in a setting that holds personal significance like your grandma's house, can be quite emotionally charged. This type of dream may reflect feelings of insecurity or fear of betrayal in your waking life. It could also signify underlying anxieties about trust in your relationship or concerns about commitment.

Grandma's house often symbolizes safety, comfort, and childhood memories. This setting could suggest that your subconscious is grappling with these feelings in a place where you felt secure and loved.

Consider reflecting on your current feelings and experiences in your relationship. Are there any unresolved issues or feelings of mistrust? This dream might be prompting you to address these concerns openly. Communication with your partner could help clarify feelings and strengthen your bond.

Remember, dreams often serve as a mirror to our emotions and thoughts, so take time to explore what this dream might be trying to tell you about your current situation.