The son did not recognise the father and the father the son. The brother did not recognise his own brother and the sister's son did not recognise his maternal uncle.
न पुत्रः पितरं जज्ञे पिता वा पुत्रमौरसम्। न भ्राता भ्रातरं तत्र स्वस्रीयं न च मातुलः॥