This dream appears to be rich with emotional significance and may reflect your feelings of loss, unresolved grief, and the connections you maintain with your parents despite their physical absence. Here are some insights into various elements of your dream:

1. Your Mother’s Visit: The presence of your mother, especially in a specific outfit she wore during a significant moment in your life (your graduation), suggests that you may be reflecting on your past and the support she provided you. Her request for photos could symbolize a desire to remember and preserve memories, either related to her or your family as a whole.
2. Slanted Kitchen Floor: The slanted floor might represent feelings of instability or imbalance in your life, especially after the losses you have experienced. It could signify that you are grappling with your current reality and the changes that have come with the deaths of your parents.
3. Father's Death: The sudden awareness of your father's death in the dream could indicate your anxiety or fear about losing family members and the burden of responsibility you may feel in dealing with these losses. Your comment about not being able to fix the house alone reflects feelings of being overwhelmed and the emotional weight of these experiences.
4. Vision of Your Father: Seeing your father in a white tuxedo surrounded by beautiful women may symbolize your hope that he is at peace and in a joyful place. The Rolls Royce, especially one that resembles a gift he gave you, indicates a connection to cherished memories and the legacy he left behind.
5. Tornadoes: The tornadoes can symbolize chaos or upheaval in your life. They may represent your fears about the unpredictability of life and the emotional storms you are navigating after these significant losses. Telling your mother to take cover suggests a protective instinct and your desire to shield loved ones from harm, even when it feels like chaos is swirling around you.
6. Your Age and Mother’s Youth: The contrast in ages between you and your mother could reflect a longing for the past or a desire to return to a time when life felt more stable and secure.

Overall, this dream encapsulates themes of grief, memory, and the struggle to maintain connections with loved ones who have passed. It may be beneficial to express your feelings, whether through talking with someone, journaling, or creating a memorial as you mentioned with the photos. Finding a way to honor your parents' memories can help you in healing and processing your emotions during this challenging time.