Use "brothers-in-law" in a sentence

1. QUESTION: What is the correct term brother in laws or brothers in law? ANSWER: The correct way to write and say this phrase and phrases like it is: brothers-in-law

2. HEARING of my predicament, my brothers-in-law searched local rubbish dumps, trying to find old parts to make a bicycle for me.

3. ‘Principle constituents: Aconitine which is one of the most poisonous of all alkaloids.’ ‘In 1881 Dr George Henry Lamson poisoned his two brothers-in-law for their legacies, at least one with Aconitine, the only recorded case of its use to kill.’

4. ‘Principle constituents: Aconitine which is one of the most poisonous of all alkaloids.’ ‘In 1881 Dr George Henry Lamson poisoned his two brothers-in-law for their legacies, at least one with Aconitine, the only recorded case of its use to kill.’