“the core question is not whether the J’s or the [foster carers] can provide better care but whether the J’s can provide good enough care. It is only if they cannot provide care of at least that standard that the removal of the girls from their family can be justified”; and, “The starting point must be that the children are best placed with close family members than strangers and should be placed with close family members unless the family is proved to be unfit, …severance from the family should only take place in very exceptional circumstances. Everything must be done to preserve families. Even if the girls might be placed in a more beneficial environment with [the foster carers] – which incidentally I do not accept – if the J’s can offer good enough care the children should be placed with them”