yes
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.