The public library has a complete set of DVD's of this program. I am about to start Season Three and enjoying the story very much. The relationships are quite complex and seem realistic to me. I have the vaguest memory of seeing one or two episodes during the 1970s. The Bellamy's, the parents, seem pretty stable but their two children have one problem with relationships after another. The only theme I noticed that's getting too repetitive is the Bellamy's tend to buy there way out of problems. Buying people off and sending them away. A few come back and again, they have to buy off the person. There's a point where the money runs out and then what do you do?
The acting is quite strong and I really don't know what might happen next. I like the sets for the house interiors. And, everybody is quite well dressed for period.
If you never saw this, it's worth a look. There are six seasons in all and a follow up years later. Not sure if that's a sequel or just a revisit.