<musing>
Perhaps this is a hidden desire to limit the size of the family for fear that the love might run out?
You can be parsimonious with your heart and choose to limit family to self, spouse, our children, our grandchildren. Or you can be profligate with your love and have a huge family which encompasses self, spouse, children, their spouses, grandchildren, step-children and step-grandchildren. If you have them, you could add in siblings and spouses, nephews, nieces and partners.
Our annual family gathering has so many people we have to hire a room in the local pub because none of us has a house big enough. It’s a rule that no-one is obliged to come - they are all invited, but I never want anyone to feel they have to be there unless they want to. The teenagers tend to go through a phase of not coming, but apart from that, all come, and then I know they all want to be together with me. The joy I get from that each year repays any effort I had to make to love new members of the family.