Final answer:
The parenting style described is permissive, in which the parents are nurturing and loving but rarely discipline the child.
Step-by-step explanation:
The parenting style described, where the parents are nurturing and loving but rarely discipline the child, and have low expectations of the child's maturity level, is known as the permissive parenting style.
Permissive parents make few demands and rarely use punishment. They tend to be very nurturing and loving, and may play the role of friend rather than parent. Children raised by permissive parents tend to lack self-discipline, and this parenting style is negatively associated with grades.
(Source: excerpt from 'For parents who employ the permissive style of parenting' by Dornbusch, Ritter, Leiderman, Roberts)