Nup.Actually the answer is Yup. Watching the commentary from Sons of Anarchy Season 2, Katey Sagal states that McNally is her sister-in-law. So, yes they are related, by marriage. I believe Katey has...
Mcnally is Katey's sister in law.
McNally Sagal is Katey Sagal's sister in law. Married to her only brother.
No, but they fuked every now and then.
Katey Sagal has been married 3 times, her current husband is Kurt Sutter. He writes Sons of Anarchy.