"Rohit Shekhar has been appointed adviser in the Transport department," an order issued by Principal Secretary, transport, Kumar Arvind Deo said.
Rohit Shekhar is the biological son of N D Tiwari and Ujjwala Sharma, who Tiwari married last year.
Veteran Congress politician N D Tiwari had accepted Rohit, who took him to court, as his son last year after his marriage.
Tiwari, who has been the governor of Andhra Pradesh and Chief Minister of Uttar Pradesh and Uttarakhand, fought his son all the way to the Supreme Court before marrying Ujjwala.
Shekhar's appointment by Uttar Pradesh government is seen as his acceptance as heir of N D Tiwari, who has cordial relations with Samajwadi Party supremo Mulayam Singh Yadav.
Mulayam often visits Tiwari at his residence here while the latter often speaks in favour of Samajwadi Party.