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family parent children support relationship adult women partner contact study journal netherland respondent difference marriage obligation adult children loneliness dykstra family members health member level people network sibling research country model child status gender effect table number father european household exchange university analyses kinderen ageing result sample solidarity group education erasmus univ rotterdam ouder pattern dutch childlessnes society mother divorce generation vrouwen change parenthood likelihood survey distance state hebben income issue europe variable jong gierveld quality course question characteristic downloaded perspective daughter family relationships population work hours