One of the many benefits of singing on Shabbos is that it creates a good atmosphere for the children, so they will love Shabbos and Hashem.
The Mahari"t (son of the Mabi"t) writes in his sefer Tzafnas Paneiach (Devarim 22:6), "There's a bird that stays far away from people, and it only comes near humans when it raises its children. This is the nature that Hakadosh Baruch Hu implanted in this bird. Generally, they [live in the desert], far away from the traps and nets that humans put out to catch them. Whenever humans come near, they fly far away. But for their children's sake, they hover over them. And at these times, even if people come near, the birds remain sitting silently over their offspring. They risk their lives and are prepared to die if need be because they are devoted to doing the service that the Creator gave this bird."
This bird's devotion to its offspring is a great lesson for us. People are busy, and there is much to do, but for your children's sake, you must be available for them. Be prepared to be moser nefesh for your children's sake. Learn with them, speak to them, spend time with them. An ideal time to do this is on Shabbos when people are more relaxed and less rushed.
Hashem said to Moshe (Bamidbar 27:18), קח את יהושע בן נון איש אשר רוח בו, "Take Yehoshua bin Nun, a person who has spirit in him." How do you take him? Rashi explains, קחנו בדברים אשריך שזכית להנהיג בניו של מקום, "Take him with words. Say, 'You are fortunate to have merited to be the leader of Hashem's children."
Rebbe Shlomke of Zvhil zt'l said that these words aren't only said to Yehoshua. These words are said to each mechanech, regardless of whether he is teaching Gemara to yeshiva students, alef beis to four-year-olds or a teacher at a girls' school. A bas kol comes forth and tells them, אשריך שזכית להנהיג בניו של מקום, "You are fortunate to have merited to lead Hashem's children." We'll add that this bas kol is also for parents. Hashem tells them, אשריך שזכית להנהיג בניו של מקום, "You are fortunate to have merited to lead Hashem's children."