The theory I've always heard is that Web Hubbell, who worked at the Rose Law Firm with Hillary Clinton, is Chelsea's biological dad-

https://files.catbox.moe/rrdm6j.png

Here's a picture of one of Web Hubbell's daughters next to Chelsea Clinton-

https://files.catbox.moe/4dy01c.png

Here's a whole writeup on the theory-

https://rielpolitik.com/2015/04/13/is-chelsea-clinton-the-biological-daughter-of-webb-hubbell-by-robert-morrow/

The theory I've always heard is that Web Hubbell, who worked at the Rose Law Firm with Hillary Clinton, is Chelsea's biological dad-

https://files.catbox.moe/rrdm6j.png

Here's a picture of one of Web Hubbell's daughter next to Chelsea Clinton-

https://files.catbox.moe/4dy01c.png

Here's a whole writeup on the theory-

https://rielpolitik.com/2015/04/13/is-chelsea-clinton-the-biological-daughter-of-webb-hubbell-by-robert-morrow/