Exactly the way you did in your question. The term father-in-law is hyphenated, and the addition of the ex- prefix requires a hyphen as well. This is not a standard genealogical term, and it may be clearer to say "ex-husband's father" or ex-wife's father.
A hyphen isn't necessary in "coordinator"
"Son-in-law" is spelled as indicated, with a hyphen between "son" and "in-law."
Not necessary,but the hyphen signifies relationship between the two words,thus emphasizing the inner value.
The plural of bye-law is bye-laws, with a hyphen.
multi-task or Multitask -the hyphen is not necessary-
Since you're changing it into a superlative, you're definitely going to use two separate words, so no hyphen is necessary.
hyphen
If your brother-in-law is your spouse's brother, then his father is your father-in-law - because he is your spouse's father. If your brother-in-law is your sister's husband, then his father is not your father-in-law.
coordinate. the hyphen is no longer necessary.
If your brother-in-law is your spouse's brother, then his father is your father-in-law. If you brother-in-law is your sister's husband, then his father is not your father-in-law, and is not related to you in any way..
Yes, unless you mean that the car salesman is a small person.