"The step-parent play a large educative role in the everyday life without any authority being granted by the law"
le beaux-parents - The step-parent
jouent - play
un rôle - a role
éducatif - educative/educational
considérable - considerable/large
au quotidien - everyday
sans qu'aucune - without any
ne leur soit accordée - being granted
par la loi - by the law
better late than never?