Yes, this is something people are lenient about: lying to children. Lying to children is not permissible; neither to adults nor to children.
Category: Hadeeth
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.
Importance of righteous parenting
And indeed, from the greatest reasons for helping to improve the Hereafter of the offspring is the righteousness of the parents; and in other words, [their setting] a good example.
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.
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!
After the Fajr prayer
Sitting after the Fajr prayer to engage in morning remembrances and reading the Qur.aan is among the Sunan (pl. Sunnah) a Muslim is encouraged to be diligent upon.