Whatever the story is, the arrest was unacceptable. The cop did not observe the man or his wife do anything. Lacking the observation of a crime, the police needed an arrest warrant that they apparently did not have.
I sure hope they victims get a hugh amount of money for spending 2 nights in jail each. I think $1,000,000 a night for each night they were in jail and another $1,000,000 per parent night the child was deprived of would be about right. I think that would total $8,000,000. That kind of cost would cause the tax payers to demand change.
I dunno - this was the same department whose officers shot a 92 y/o woman through her door, planted drugs on her corpse, and had the officers involved get off with involuntary manslaughter convictions.