Yes, this is something people are lenient about: lying to children. Lying to children is not permissible; neither to adults nor to children.
Category: Prophet Muhammad ﷺ
They are the ones who will succeed you when you die
Take care of your children. Your profitable 'trade' [with Allaah] is undoubtedly your children.
Keep a protective eye over your children
Then, as for you O Father! Observe your children['s activities] – [even] outside the home. Where did they go? Who do they mix with?
Do not be negligent in watching over your children
[And] many of them are very negligent [of their responsibility] towards their children.
Definitive proof against celebrating the birthday of the Prophet ﷺ
These are three important questions related to those who practice the innovation of celebrating the birthday of the Prophet ﷺ.
Do we love the Prophet ﷺ more than they did?
I say that celebrating the birthday of the Prophet ﷺ was not [something] known [to have been practiced] by the righteous predecessors.
Then he is lying in his love for the Messenger ﷺ
As for the one who claims that he loves the Messenger ﷺ, and then he does not follow him, or that he introduces an innovation and thinks that he loves the Messenger while he introduces an innovation...
Attaining completeness of the soul
Indeed there is no completeness for the soul other than through invoking prayers and salutations upon the Prophet ﷺ - which is from the prerequisites of loving him, and following him, and placing him...
Celebrating the birthday of the Prophet ﷺ
By Allaah! If Ahlus-Sunnah knew their beloved [Prophet] ﷺ loved his birthday [to] be celebrated, none would have preceded them in it; they would celebrate it every day!
The four levels of the fast of 'Aashooraa
The fast of 'Aashooraa has four levels. The first level is to fast the 9th, the 10th and the 11th [days of Muharram].