Is waking up a younger brother for prayer considered an act of corruption that necessitates abandoning it to avoid parental anger?

Waking a sleeping child at this age is not obligatory, but it is preferable. If doing so angers the parents, then he should be left alone, though it is permissible to advise the parents gently and respectfully by explaining the virtue of waking a young child for prayer and raising him to revere the rituals of religion.