I think he would cover for Patsy, if he thought daddy would cut him off from the cash flow. Hey wouldnt that make Patsy the cash cow? Money is a very strong motivator, its what drove that whole family and their circle of friends and acquaintances. We tend to ignore the potency of the almighty dollar.
Or, he knew that his Dad was equally involved. He truly did seem the most upset of everyone in the fancily. That could be love, anger, guilt, or a combination of the above. I am also not totally convinced that the suitcase wasn't more important.