The relationship of a stepbrother's son to someone would be that of a step-nephew. This is because the stepbrother is not biologically related to the person, but is a relative through marriage. Therefore, the stepbrother's son would be the person's step-nephew, as they are the child of the stepbrother.
Your step-son is the child of your spouse and another person, and is of no true genealogical relationship to you. So your step-son's children would also be of no true genealogical relationship to you either. However, they would commonly be called your step-grandchildren and you would be their step-grandfather or step-grandmother.
If they are not your daughter's children, then they are all step children. They will be called step-grand children. If they have children, those are step-great grand children. If they are your daughter's children, you must know that they are your grand children as they are directly related to you.
The meaning of the terms "step-son" and "son-in-law" were the same in the 19th century as they are today. Your step-son is and was the son of someone you marry after that person's spouse, the other parent of the son, has died or been divorced. You are then i the position of being a surrograte parent to the step-son, without being the biological parent, and without formally adopting him. Your son-in-law is and was the husband of your daughter.
no
You sister-in-law is your son's aunt. the relationship consider age diff.if she is lower age what is his relationship.
Step-brothers
If her son is from a previous relationship, then he would be your step-son.
Step Nephew
Great uncle / Great nephew
step brothers
step-granddaughter
No because that would be your cousin
Your step-son is the child of your spouse and another person, and is of no true genealogical relationship to you. So your step-son's children would also be of no true genealogical relationship to you either. However, they would commonly be called your step-grandchildren and you would be their step-grandfather or step-grandmother.
Your grandson is the great-nephew of your brother.
Step father and son
Your mother's new husband is your step-father and you are his step-son or step-daughter.
Yes, she did. She had the relationship of a mother that a mother has with her son. As most mothers do.