He and his wife don't seem to be lower class people. I'm shocked that he is able to be married, for one thing. They seem socially middle class, and in that social strata it is a big accomplishment for a man who isn't the top breadwinner to be able to stay married. Generally women will insist on that. Or men will insist on it. Or both . . .
But the exchange didn't give me enough to say his type. But ISFP remains plausible, and the way he spoke to his wife and the way he acts does seem SPish. Since I reject ESTP, and ISTP doesn't make sense at all, he should be ISFP or ESFP. You select ISFP; have you considered ESFP? I admit that it doesn't seem as likely as ISFP; I think you've got him right. I'd put 75% odds that he's ISFP at this point.