Los abuelos no custodios que se involucran de manera moderada (aproximadamente 1 día por semana) aportan al desarrollo del nieto (menos problemas conductuales, mejor lenguaje, prosocialidad) y también a su propia salud y longevidad. El cuidado intensivo (más de 40 horas semanales o custodia plena), en cambio, se asocia con mayor depresión y sobrecarga en la abuela. La dosis importa: el efecto tiene forma de U.

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