In-laws are not related.
they would be brother in laws
The cousins of your in-laws are not related to you and neither are their parents. However, the parents of your spouse's first cousins are your spouse's aunts and uncles, and thus your children's great aunts and great uncles.
No.
Yes, you are related to your brother-in-law's grandson. Your brother-in-law's grandson would be your nephew once removed. This means that you are not directly related by blood, but you share a family connection through your brother-in-law's family.
Your brother-in-law's brother. Though many will refer to them as a brother-in-law, they technically are not related to you.
Nothing, you are not related, unless the baby is your sister's baby as well, in which case they would be your niece or nephew.
You are not related. Your granddaughter is by marriage.
Your wife's sister's husband is your wife's brother-in-law, but is not related to you.
Your brother's estate would be distributed according to the laws of intestacy in his state. Generally, his parents would be his next of kin. If his parents are not living then his siblings would be next in line. You can check the laws in his state at the related question link provided below.
They are related as in-laws... Matt is Elisabeth's brother-in-law. Her husband plays for AZ and his brother, who is Matt Hasselbeck, plays for the Seahawks.
You are not related as you do not share a common ancestor.
They are brother in laws, their wives are sisters.