I'll try to be brief.
Two people, mid 20s have been working together and in a relationship. They're of equal grade and there are no rules against it.
The relationship has ended. Woman is managing well, going to work and doing what's needed. Man is not doing well, had a week off work sick (MH), returned but spent the morning in tears and was sent home. Now signed off.
The mother of the woman has contacted the company to say man followed daughter home, driving very close behind, flashing lights and then boxed her on once she parked. Father came out and dealt with him. Father is big and scary, although I don't think there was actual violence. Woman does not know mother contacted work.
If you're the boss in this situation, what do you do, I.e. what should either of the employees expect?