Lynn Patton who has worked for DJT says that the only reason Cohen is talking is because Mueller threatened to put Cohen’s wife in prison for 30 years. See X22 Report for details.
The Germans have some lovely words such as sippenhaft, which is basically making a family collectively guilty. In the 1940's, a politically-connected guy named Müller - or without umlaut, "Mueller" - relentlessly dealt with "crimes" and was enthusiastic about such things.
I wonder what the German term for "threatening the rest of a family if one member doesn't collaborate" is? I'm sure it would be mellifluous.