I've heard it said before, "You treat your friends better than you treat your family." I guess what it means is that we are just really comfortable with our families, and usually feel certain that we can speak to them and treat them however we want, whether it be good or bad. This is because our families (usually) love us unconditionally. This isn't always the case with friends. So, the proverb is stating the obvious. We should treat our families like our friends and treat our friends more like our families. Makes sense to me!