D,
Read up on my threads...very similar sitch. My H still has not taken anything out of the house, however he has gotten much WORSE since he left...we have been sep. 4 months and he has a younger OW...H basically lives with her except when he has the kids...

As far as a PI...don't bother...My L said as long as they admit it that is proof enough (at least in my state)

H did file for D and we go to court in June. H is out of his mind, the things he is doing are so out of character...anyway read up on my posts and the great advice I was given!

I hope your Dad is OK!