is it wazib for me and my wife and 5 children age between 1 and 14 to give qurbani
If you are someone who must pay annual Zakah then Qurbani will also be Wajib upon you. If your wife pays Zakah and she has her own money then she would have to make Qurbani as well. If you want to make Qurbani on her behalf then you would have to ask for her permission.
Qurbani is not Wajib upon children who have not reached the age of puberty. Those children of yours who have reached the age of puberty and possess sufficient wealth that Zakah becomes obligatory upon them then Qurbani will be Wajib them as well. Otherwise there is no Qurbani upon them.
And Allah knows best.
Mufti Ikram ul Haq
Fatwa Center of America