It means that you've gone peculiar with grief or loneliness.
It means you love and miss your husband.
Call her by her name.
Sychaeus
It means you were dreaming.
You would call your husband's cousin by name or "my husband's cousin." In the English language and culture, the cousin of your spouse is not considered to be related to you.
You could call him by his name, or more generally as your 'brother in law'
Her husband real name is Christian but people call him Pancho
There is no special name for a woman whose husband cheats on her. The name of a man whose wife cheats on him is a cuckold.
Your son in law or by his name
Your mother-in-law. Or, call her by her name.
The woman is a widow.
Your sister's husband is your brother-in-law, but in conversation you would not use that term as a title, but would call him by name.