I don't have any data regarding the popularity of 'kazoku haha to shimai no kyousei visual novel'. Popularity can be measured in different ways, such as the number of downloads, ratings, or how often it's discussed in relevant communities. Without these details, it's impossible to accurately say whether it's a popular visual novel or not.
I'm not entirely sure as I haven't directly experienced this visual novel. It might be about the relationship between a mother in the family and sisters, perhaps exploring family dynamics, sisterly bonds, and various interactions within a family - but this is just speculation.
I'm not sure specifically as it's not a widely known mainstream visual novel. It could potentially be about unique characters and their growth or relationships within a fictional setting.
Hard to say. It could be on hiatus, but without concrete information, it's difficult to give a definite answer. Try following the mangaka's social media or the manga's official website for the latest.