father naturalised irish citizen wants to apply for minors

hello,
I have a question for one of my friends. he has recently been naturalised as an Irish citizen. he lives in Belfast. his family lives in Pakistan. he has minor kids(i.e. under 18). they were born before he was naturalised now he wish to apply for the kids Irish citizenship. can anyone tell me what's the process for the application and how long will it take. kids are still living in Pakistan.

kids are under 18

1. Bring the children to Ireland. They are the children of an Irish citizen and he lives here so they cannot be denied permission to come to Ireland.

2. They were born before he gained citizenship, so their journey to citizenship is the same as his. They must live in Ireland for the required period of time, be of good character (not a problem as children are very young and automatically of good character) and then apply after they have been living in Ireland for the required period of time.

3. Note that if he plans to have additional children and if the mother can manage to give birth on the island of Ireland then the child is automatically a citizen and the mother can apply to remain in Ireland under Zambrano ruling. It is not required that she be married to the father, just that she give birth to citizen child on the island of Ireland.

4. Note that if a child is born abroad AFTER he gains citizenship he may register the child in the register of foreign births, using the birth certificate that names him as the father of the child. He should make sure that his name on the birth certificate is exactly the same spelling as the name in his Irish certificate of naturalisation or Irish passport. Use the birth cert to register the child in the foreign births register and then use the registration to apply for Irish passport for the child. This gives Irish citizenship to a child born overseas but confers no rights on the mother of that child.

5. If he wishes for his wife to join him and to have this right automatically he must travel to an EU country other than Ireland, work there and apply for his wife to join him under EU migrant worker law. This is a guaranteed right, but it requires him to work. His wife will get permission to travel within three months, but the requirement is that he works in an EU country that is not Ireland, such as Britain.

If the children wish to continue to live in Pakistan there is no route to Irish citizenship, and the route through living with their Irish father closes when they are no longer dependent at the age of 18 years.

6. If he brings the children to Ireland he may claim child benefit and if on a low wage he may claim Family Income Supplement also. If married and if his wife joins him in Ireland he may claim the tax advantages of a married man. It is best if he can bring the children to Ireland before the age of 12 years, as it takes time to get citizenship and they need Irish citizenship to go to Irish university for free.