Seeking permission from wife, children or parents for second marriage (nikah)is not obligatory in Shariah. However, keeping in view moral values, if permission is obtained, it is more preferred.
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دلائل:
القرآن الکریم: (النساء، الآیۃ: 3)
فَانْکِحُوْا مَا طَابَ لَکُمْ مِنَ النِّسَآءِ مَثْنٰی وَثُلَاثَ وَرُبَاعَ فَاِنْ خِفْتُمْ اَلَّا تَعْدِلُوْا فَوَاحِدَةً۔۔۔۔الخ
Allah knows best
Darulifta Al Ikhlas,Karachi