It doesn't bother me in the least that my neighbors and casual acquaintances do not engage me where I live. I expect such relations to be superficial and conventional. But I expect more from relatives even though this expectation is irrational.
I have no trouble accepting that propinquity is no guarantee of spiritual affinity. Why then do I suppose that consanguinity should be such a guarantee?
Blood is thicker than water, but for a Luftmensch, pneuma is what counts.