"We are family."
Think of the Human family as a vast, a globe-wide-spanning tree, with uncounted branches and leaves. All those branches sprout from the same trunk, all those leaves sprout from different branches. We all our children & descendants from the same roots.
That should be the Default Mode. Friends & Family. Some of us are best friends. Some of us are a bit estranged. Some relationships are free and easy, some are hard and difficult. Also some friends are really our enemies, and you must not forget your nemesis, who is lurking in the shadows waiting to pounce! Human Beings are tricky!