Muslim is responsible to rectify himself and others as much as he can. Amr Bil Ma'roof and Nahi Anil Munkar is one of very important obligatory duties on every Muslim just like Namaz, fasting, Zakat, Khums, Hajj etc.
We must try our best to correct ourself and others as much as we can, but we have to be polite with others and never hurt their feelings. We have to have wisdom and good advice when calling people to the Way of Allah ( 16:125).
We are not allowed to be negative in front of wrong faith or wrong behaviour, because negative attitude can indirectly endorse or encourage wrong. We must try to do our best to help others and make them aware about the truth and never leave them indulging in wrong when we can help them. It is very important to do this responsibility with wisdom and good way of advice.
We respect every human being because Allah has granted honor to all human beings (17:70) and we feel for them and been ordered to help them as much as we can. Respecting others does not mean letting them do wrong, and accepting them does not mean accepting or endorsing the wrong.
The Special treatment to Sadat who are the grandchildren of the Prophet Muhammad ( SAWA) is based on the respect and love to the Prophet ( SAWA) and his Holy Progeny ( AHLUL Bayt) (AS).
The great services rendered by the Prophet and his Ahlul Bayt to the whole Muslim Ummah can not be thanked at all by us, but Allah (SWT) has told the Prophet in Quran to tell Muslims : I do not ask you ( for my efforts ) any remuneration but only the love and kindness to my Progeny. ( Sura 42, Verse 23).
The Prophet (SAWA) told Muslims : Love Allah for what he is showering on you from His bounties, and love me for the love of Allah, and love my Progeny Ahlul Bayt for my love.
( Tirmithi , number 3792,
and Al-Mustadrak by Al-Haakim 3/150)
He also said in another authentic Hadeeth : No one from you Muslims will be real believer in Allah until he loves me and my Progeny Ahlul Bayt more than his love to himself and his family.
Kanzul Ommal 70/91.
We must show our respect to the grandchildren of the Prophet (SAWA) and Ahlul Bayt (AS) for the sake of Allah and love and respect to the Prophet and Ahlul Bayt.
Poor Sadat are not allowed to utilize Zakat from people, that is why Allah has kept for them the right in half of the Khums as far as they are really needy.
The history of Muslims has hundreds of incidents of the sufferings of Sadat by the enemies of Ahlul Bayt and it is still going on in many places.
Respecting the grandchildren of the Prophet and Ahlul Bayt is one of the signs of real Faith and respect to the Prophet and Ahlul Bayt.
No you can never ignore your child, you must be a role model and an example. If he is disrespectful there might be a reason, nobody grows up to become disrespectful by themselves. You must understand the reasons behind, and see the bigger picture. All of us react differently and even our child may grow up to become totally different than us, but we must continue to love them unconditionally and show them a path of beauty and compassion. Imam Zayn al-Abideen as-Sajjad (alayhi salam) taught us that only goodness can erase evil, and it is very beneficial to read his dua makarim al-akhlaq every day, especially when you are going through hardship.
Keep in mind these phares:
“Make me worship You
but do not let my worship be corrupted by conceit.
Let good flow out from my hands for people,
but do not let me erase it by making them feel obliged.
Grant me the highest moral traits,
but protect me from vanity.
O Allah, bless Muhammad and his family,
Raise me not a single degree with people
unless You have lowered me an equal amount,
“O Allah, bless Muhammad and the family of Muhammad.
Replace for me;
the enimity of the people of hatred with love,
the jealousy of the rebellious people with affection,
the suspicion of the virtuous people with confidence
the enmity of the close ones with friendship,
the disrespect of relatives to devotion,
the desertion of the close ones with help,
the attachment of flatterers with reformed regard,
the rejection of associates with good behaviour,
and the bitterness of the fear of oppressors
with the sweetness of security.
O Allah, bless Muhammad and his family,
a hand (power) over one wrongs me,
a tongue over one who disputes with me,
and a victory over one who stubbornly resists me.
craftiness against one who deceives me,
power over one who oppresses me,
refutation of one who accuses me falsely,
and safety from one who threatens me.
Give me the success to,
obey one who directs me to what is proper
and follow one who guides me to what is right.”
You must find it in yourself to love him, and let your love erase his errors. You must find it in yourself to be an example of compassion and patience.