Manusmriti
आचार्यश्च पिता चैव माता भ्राता च पूर्वजः । नार्तेनाप्यवमन्तव्या ब्राह्मणेन विशेषतः ॥ २२५ ॥
The teacher, the father, the mother, and an elder brother must not be treated with disrespect, especially by a Brahmana, though one be grievously offended (by them).
english translation
AcAryazca pitA caiva mAtA bhrAtA ca pUrvajaH । nArtenApyavamantavyA brAhmaNena vizeSataH ॥ 225 ॥
hk transliteration by Sanscript