Your husband's father is your father-in-law. If that's what you are asking, the wording is a bit confusing.
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In normal Anglo-Saxon usage, there is no special relationship between spouses' parents or families; each spouse becomes a de facto member of the other spouse's family, but the relationship doesn't extend beyond the spouses themselves. For instance, if your spouse and his parents were to die (god forbid) you would have the right to inherit as a member of the family, but your siblings and parents would have no such rights. This may not hold across cultures - it is conceivable that other cultures would have more defined relationships between spousal families - but it is the case for Western/European descended cultures.Probably your niece-in-law.
your father-in-law's house
The wife of your first cousin is not related to you.
Your half-brother...
You are not related as you do not share a common ancestor.
A relation on your father's side of your family is called a paternal relation.
Your father's father's brother is your great uncle.
auntie
That's a relation by marriage. Your wife's father is your father-in-law.
no
They are your biological parents.
stepmother