My first instinct is that Robert is a Nine. He likes to keep the peace and avoid conflict. He also tries to be a fair manager of his household staff and his tenants. Every now and then he’ll go off, but mostly he likes it calm. Isis the dog is one of his coping mechanisms, and his ulcer is a sign that he doesn’t always succeed.
He kind of snaps into place, doesn’t he? I suppose he could possibly be a Two. All of the above traits could also fit. I’m going to say no, though. He attends and gives parties without a social person’s joy. His attitude is more one of duty. A Nine is always a good host, hoping to put people at ease and give them a good time. He’s also the only other family member who rides with the hunt.
Daughters who are an Eight, a Two, and a Three align with a Nine father, as well. Now I wonder about Cora!