AU: Skye is Tony Stark’s daughter.
"That’s why I learned to crack systems, why i joined the Rising Tide..to find any details I could about my parents. There’s nothing. No records. There’s no trace of them. My lifelong search has led to a single document…redacted."
(I know the chances of this happening are close to none, but it would be so awesome. Besides I used this as an excuse to make parallels between the two characters.)