Supplication for the Guidance of Someone You Love

Yes,
there are many du’as which we may say for those whom we love and those whom
we do not love to be guided. We can say: O Allah guide him; O Allah, make
him guided and a guide to others; O Allah, open his heart to the truth; O
Allah, help and guide him; O Allah, take him by the forelock and guide him
to righteousness and piety; O Allah, bring him back to You; and so on. 

Du’as for guidance that have been narrated
in the sunnah (prophetic teachings) include the following: 

Al-Bukhari and Muslim narrated that Abu
Hurayrah (may Allah be pleased with him) said: Tufayl ibn ‘Amr al-Dawsi came
to the Prophet (peace and blessings of Allah be upon him) and said: “Daws (a
well-known tribe) are doomed, they have disobeyed and been stubborn. Pray to
Allah against them.” He said: “O Allah, guide Daws and bring them here.” 

2 – Muslim narrated that Abu Hurayrah (may
Allah be pleased with him) said: I used to call my mother to Islam when she
was still a mushrik (polytheist). I called her one day and she said
something about the Messenger of Allah (peace and blessings of Allah be upon
him) that I did not like to hear. I came to the Messenger of Allah (peace
and blessings of Allah be upon him) weeping, and said, ‘O Messenger of
Allah, I have been calling my mother to Islam and she refuses. I called her
today and she said something about you that I did not like to hear. Pray to
Allah to guide the mother of Abu Hurayrah.’ The Messenger of Allah (peace
and blessings of Allah be upon him) said, ‘O Allah, guide the mother of Abu
Hurayrah.’ I went back, feeling optimistic because of the du’a of the
Messenger of Allah (peace and blessings of Allah be upon him). When I came
back, I went to the door and found it locked. My mother heard my footsteps
and said, ‘Stay where you are, O Abu Hurayrah.’ I could hear the sound of
water. She washed herself (did ghusl), put on her chemise and quickly
covered her head with her head cover, then she opened the door and said, ‘O
Abu Hurayrah, I bear witness that there is no god except Allah, and I bear
witness that Muhammad is His slave and Messenger.’ I went back to the
Messenger of Allah (peace and blessings of Allah be upon him), weeping with
joy, and said, ‘O Messenger of Allah, good news! Allah has answered your
prayer and guided the mother of Abu Hurayrah.’ He praised and thanked
Allah.” 

3 – al-Bukhaari and Muslim narrated that
Jarir (may Allah be pleased with him) said: The Prophet (peace and blessings
of Allah be upon him) did not refuse me permission to enter (upon him in his
house) since I became Muslim, and whenever he saw me he smiled at me. I
complained to him that I could not sit firmly when riding a horse and he
struck me on the chest with his hand and said, “O Allah, guide him and make
him a guide to others.” 

The du’a should be accompanied with
certain faith in a response, and you should choose the times when a response
is more likely, such as the last third of the night, between the adhan (call
to prayer) and iqamah (final call to prayer), whilst prostrating, and after
‘Asr (afternoon prayer) on Friday, as well as seeking to ensure that one’s
income and food are halal (lawful), and other etiquettes of du’a. See
question no.

36902.

And Allah knows best.