Asalaamu 'alykum (peace be upon you) brother.
Your main duty right now is to convey the message clearly.. then pray to Allaah for their guidance. We will also pray for them insha Allaah (God willing.)
Also, any good deeds a person does in this life, if they're not doing it to please Allaah or for the hereafter, then there reward would be in this life. i.e. if someone worked hard to do good to get popular for example, then Allaah may give them popularity in this world instead of the hereafter.
Also, if someone does an act of worship for Jesus son of Mary (peace be upon them) for example, then these people will be required to get their reward off them on the Day of Judgement. However the reward will be with no-one except Allaah on that day.
I also want to show you this narration since it's really sad.. and it occurred within the life of Allaah's Messenger, Muhammad (peace be upon him):
Abu Talib’s Death:
In Rajab, the tenth year of the Prophethood, Abu Talib fell ill and passed away, six months after leaving the confinement at Ash-Sh‘ib. In another version, Abu Talib breathed his last in Ramadan, three days prior to the death of Khadijah (RA). On the authority of Al-Musaiyab, when Abu Talib was on the death bed, the Prophet
entered the room where he saw Abu Jahl and ‘Abdullah bin Abi Omaiyah. He requested his uncle: "My uncle, you just make a profession that there is no true god but Allâh, and I will bear testimony before Allâh (of your being a believer)".
Abu Jahl and ‘Abdullah bin Abi Omaiyah addressing him said: "Abu Talib, would you abandon the religion of ‘Abdul-Muttalib?" The Messenger of Allâh
constantly requested him (to accept his offer), and (on the other hand) was repeated the same statement (of Abu Jahl and ‘Abdullah bin Abi Omaiyah) — till Abu Talib gave his final decision and he stuck to the religion of ‘Abdul-Muttalib and refused to profess that there is no true god but Allâh. Upon this the Messenger of Allâh
remarked: "By Allâh, I will persistently beg pardon for you till I am forbidden to do so (by Allâh)".
It was then that Allâh, the Magnificent and Glorious revealed this verse:
"It is not (proper) for the Prophet and those who believe to ask Allâh’s forgiveness for the Mushrikûn
(polytheists, idolaters, pagans, disbelievers in the Oneness of Allâh) even though they be of kin, after it has become clear to them that they are the dwellers of the Fire (because they died in a state of disbelief)." [9:113]
And it was said to the Messenger of Allâh
: "Verily! You (O Muhammad ) guide not whom you like." [28:56]
It goes without saying that Abu Talib was very much attached to Muhammad
. For forty years, Abu Talib had been the faithful friend — the prop of his childhood, the guardian of his youth and in later life a very tower of defense. The sacrifices to which Abu Talib exposed himself and his family for the sake of his nephew, while yet incredulous of his mission, stamp his character as singularly noble and unselfish. The Prophet
did his best to persuade his octogenarian uncle to make profession of the true faith, but he remained obdurate and stuck to the paganism of his forefathers, and thus could not achieve complete success. Al-‘Abbas bin ‘Abdul-Muttalib narrated that he said to the Prophet
"You have not been of any avail to your uncle (Abu Talib) (though) by Allâh, he used to protect you and get angry on your behalf." The Prophet
said: "He is in a shallow fire, and had it not been for me, he would have been at the bottom of the (Hell) Fire."
Abu Sa‘id Al-Khudri narrated that he heard the Prophet
say, when the mention of his uncle was made, "I hope that my intercession may avail him, and he be placed in a shallow fire that rises up only to his heels."
We will continue praying for their guidance, and we pray you have the courage and strength to convey the message clearly to them and that they be rightly guided. ameen.