1. I was having dinner, talking with my wife.
2. I was having dinner and talking with my wife.
3. I was having dinner as I was talking with my wife.
4. I was having dinner while talking with my wife.
I think 1 2 4 are okay, except 3. But 2 sounds awkward. The best choice would be 1 or 4.
They are all OK. However, I think the focus is odd in 3 and 4. I'd prefer this: I was talking with my wife [as I was / while] having dinner.
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They are all OK.
However, I think the focus is odd in 3 and 4. I'd prefer this:
I was talking with my wife [as I was / while] having dinner.
CJ