that night he got REAL drunnk and was yelling to himself (by the way his 6 year old daughter was in the house sleeping)
Vela, the above indicates to me that certainly emotional harm would be done...his daughter might be used to this, but it will stay with her in a bad way...at 6 years old, that would be scary. Of course, we are not talking overnight visits with the unborn one.

If the dad can have sober visits in the future, that is one thing. I think maybe the grandfather has custody of the daughter?

Yes, a child may well have a right to know who their parent is...but that parent has to earn a bit of that priviledge.

JMO