No, I don't think so. I am guessing no, since Stephanie is married.
No.
no they are not(;
No. But who knows? Celebrity's families are always telling lies and saying, "Oh, I'm related to Adam Sandler!" and stuff like that.
Breckin Meyer isn't listed on her Wikipedia as being a relative. She has five siblings: Seth, Jacob, Emily, Paul, and Heidi, for which she named characters in Twilight after. She is married to...