your father in law
No. An Uncle is the brother of either your Mother or Father. You're kids may call him 'uncle'
They arent
Yes, you can.
Your brother would call your husbands sister by her first name. Or, "my (sibling's) sister in law.
you call her your daughter's husband's sister
well i think you would it would be your mom i mean OK if your father in law had only one kid it would be your husband. and your husbands mother in law would be your mom.
Well, I call her Abigail, but different strokes, etc.
Your cousin in law
Its would be your neice
brother in law
Sister-in-Law
You would call your husband's younger brother a brother-in-law.