Of course, the correct answer is that it depends on the couple.
Look, my in-laws stop by without calling first. So does my sister – and I stop by her place unannounced at times too – but that’s because we have that sort of close relationship. Others may not have it.
By all means, if a couple asks that you call first before coming over, then they’re wishes should be respected — and it doesn’t matter if it’s parents, sisters or brothers, in-laws or even adult children who no longer live in the house.
The Wolfr