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I am trying to fill out the ILR application SET-O for my dependent partner of GT and my dependent child over 18.
Under the main application, an option to add an applicant for the dependent child  ( that is also Set-O) does not ask any questions about life in the UK or the English language.

Do I need seperate application for a partner and a dependent child over 18, in that case how do I link the two applications? Is any one faces this? Kindly advise me, please.

A separate application is needed for a child who has turned 18. Such a person must meet the English language and LIUK requirements, will be subject to the criminality rules and should not be leading an independent life.

There is no need to link anything as UKVI knows the rules and considers their application based on their parents' immigration circumstances