Tier 1 (Exceptional Talent) visa : Passport Validity for a child

[mspawar]

I need a help. I am successful Tier 1 Exceptional Talent applicant.
With this visa I came to UK in the month on November 2017 and have been doing great.

Now I am planning to apply for a visa for my 3 year old child and my wife. For my wife I am applying for five years visa as she has a passport that is valid for next 8 years. My query is regarding my child.

My visa is valid for another five years (Mar 2023). Can I apply for a visa for my child for five years. Problem is that he has valid passport till July 2021 which is three years from now.

Please suggest an option:

1) Visa for 3 years
2) Visa for five years

~Regards

[mspawar]

I am applying for three years as with this time I can apply for ILR. And then dependents can also follow same route.

[CR001]

My understanding is that dependents apply for and get the same visa validity as the main visa holder.

Did you not get a BRP card to collect in the UK once you arrived??

PBS Dependent visa holders require 5 years residence to qualify for ILR as far as I understand the immigration rules.