In a Thai / USA or Thai / UK legal marriage and the father is the person having citizenship that was passed to the children, the children are younger than 16. The passports are valid for 5 years. If the citizen dies and the child's passport requires to be renewed after the fathers death, how does the Thai mother go about doing that?

For the UK it should not be a problem.

 

See Overseas British passport applications and the links from there.

Here is the process for renewing a child's (ages 0-15) US passport at the US Embassy in Bangkok:

https://th.usembassy.gov/u-s-citizen-services/passports/minor-passport-renew/

 

To make things easier for your wife it would be possible I imagine to download and fill in (to the extent possible) the DS-11 application before it is needed.  It may also be possible to download and fill in the DS-3053 (permission from parent not appearing in person) before it is needed.  I imagine in the event of your death, your wife would need to provide a death certificate in order to renew your child's US passport.  The reason being that it takes both parents of a child to renew the child's passport.  I guess you could give your permission in advance (not sure how far in advance it would be considered valid though), or your wife would need to present documentation (i.e., a death certificate) to account for you not appearing at the appointment.

Hope this helps.

On 1/2/2017 at 7:05 PM, skatewash said:

Here is the process for renewing a child's (ages 0-15) US passport at the US Embassy in Bangkok:

https://th.usembassy.gov/u-s-citizen-services/passports/minor-passport-renew/

 

To make things easier for your wife it would be possible I imagine to download and fill in (to the extent possible) the DS-11 application before it is needed.  It may also be possible to download and fill in the DS-3053 (permission from parent not appearing in person) before it is needed.  I imagine in the event of your death, your wife would need to provide a death certificate in order to renew your child's US passport.  The reason being that it takes both parents of a child to renew the child's passport.  I guess you could give your permission in advance (not sure how far in advance it would be considered valid though), or your wife would need to present documentation (i.e., a death certificate) to account for you not appearing at the appointment.

Hope this helps.

very helpful, thanks