English to Portuguese Science Psychology Psicologia do Desenvolvimento

Bom dia, caros colegas.
Necessito da vossa melhor tradução para «parental warmth». O texto onde se encontra esta expressão de psicologia de desenvolvimento é de um livro sobre genética para um público leigo.
Muito obrigada pelas vossas sugestões.
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CONTEXTO
The parent-child bond [aqui tanto se refere ao pai como à mãe] -- the so-called 'parental warmth' -- depends equally on the genes inherited by the parent as well as the child. This was confirmed by a detailed psychological study of 1,400 parents of twins in the US that showed the importance of genetic factors on both the reactions and perceptions of parents and children. Warmth involve levels of hormones produced by the body. One of these hormones is oxytocin, which is responsible for the feelings of wellbeing and familiarity. The gene influencing response to this hormone (oxytocin receptor gene) may be important in determining different responses and bonding. Different genes and chemicals clashes between individuals may explain why some parents bond better with one child than the other, despite identical environments, upbringing and the best intentions.
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