Keep those thoughts in the "strictly private" vault, enjoy the fact that your partner has great genes, and keep your focus on the woman who actually chose to be with you.
While internal thoughts are private, acting on or voicing this sentiment carries high risks: The Comparison Trap: My Girlfriend-s Mom Is Much Finer than Her- So ...
Now we arrive at the keyword’s conclusion: “So…” The “so” implies a decision, an action, or at least a consequence. Here are the realistic paths that lie ahead. Most of them are bad ideas. One of them is the mature escape route. Keep those thoughts in the "strictly private" vault,
"Is everything okay?" Maya whispered, nudging me. "You’re being so quiet." Most of them are bad ideas
"Wine?" Elena asked, glancing over her shoulder. Her smile was easy, the kind that reached her eyes and stayed there. "Please," I said, a little too quickly.