I am interested in the determinants of quality of life (QoL) for parents of chronically ill children. The respondents are the father and mother of the same family. My dependent variable is the QoL of the parents (quantitative variable) with covariates such as socio-demographic, socioeconomic and psychosocial variables. The question I am trying to answer is: What are the determinants of parental QoL?

So what models should I use between GEE and LMM?

Thank you for your assistance