Your dream appears to be rich with symbolism and personal significance, especially in relation to your experiences and feelings surrounding the restaurant and the Lipson family. Here are some interpretations and insights based on the elements of your dream:

1. Glowing Laminated Plastic: The glowing laminated plastic may symbolize clarity or illumination of a situation that was previously obscured. It represents receiving news (about the restaurant closing) that brings up strong emotions for you. The fact that it glowed suggests that this news is significant and perhaps highlights an important realization or truth.
2. Family Dynamics: The presence of your family seated at the dining table while you and your dad are excluded could represent feelings of isolation or disconnection within your family unit. It may reflect a desire for support during a difficult time or an internal struggle with how to express your feelings about the situation.
3. Whispering to Your Dad: Sharing your thoughts about the Lipson family in a whisper indicates a conflict within you. You want to express your feelings but are cautious about the potential fallout, especially considering your dad's wife's background. This suggests a tension between your beliefs and the relationships in your life.
4. Cold Outside: The coldness you felt when stepping outside may symbolize emotional discomfort or the harsh reality of the situation. It could reflect feelings of sadness or loss regarding the restaurant, as well as the chilly atmosphere of confronting difficult truths.
5. Ritchie Lipson: Encountering Ritchie Lipson in a casual setting (wearing shorts and a hoodie) could represent a more personal connection to the situation. You may feel conflicted about your experiences working with the Lipson family, which are interwoven with your feelings of betrayal and disappointment.
6. The RV and Sunshields: The RV, often associated with travel and exploration, might signify a journey you are on related to your feelings and experiences. The act of removing the sunshields suggests a desire to clear away obstacles and see things more clearly, but the number of sunshields indicates complexities and layers to your feelings that may need unpacking.
7. Old RV: The old RV that hasn’t been driven in a long time could symbolize neglected feelings or unresolved issues related to your time working for the Lipson family. It may suggest that you need to address these feelings to move forward.

Overall, this dream seems to reflect a mixture of unresolved emotions about the restaurant's closure, your relationship with the Lipson family, and the dynamics within your own family. It may be beneficial to explore these feelings further, perhaps by journaling or discussing them with someone you trust. Consider what the restaurant and your experiences with the Lipson family represent for you and how they relate to your current life and relationships.