Sorry for writing further. People say that as per shastras, the Upanayanm is to be perfomer in the even year like 6,8 etc. including Garbhavasam. Hence it should be odd age like 5,7, 9 in the earthly sense is to be chosen. Since your reply is not clear whether we can perform upanayanam for our brother's son show is running 8th year (ie. as per shashtras, including the garbhavasam it becomes 9, even year). Please do not get angry. Kindly clarify, swamin.
Kochappaa dasan

Dear Sir,
I am humbly submitting the below reference for your question.
Kindly forgive me for the word which made you to feel my angry, which was not my intention also.

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Below are the pages from Griya Sutra about Upanyanam - age - regarding