I'd only like a family dynamic if its on another Earth. I don't want pre-FP Superman and Lois sticking around. I don't need them dead, that's just one possible outcome, but I need them gone off the planet. If they want the family dynamic, do it on another Earth; if they want Jon on the main Earth, which I personally find the most intriguing option (an oddity for me because of my usual distaste with alternate characters), then his parents need the boot.
You can get away with two Supergirls running around. You can get away with two Superboys. You can't get away with two Supermen and two Lois's. There needs to remain that one and only feel with those characters.