Should he be charitable towards his brother and pray with him at a time when prayer is disallowed?

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Check below answers in case you are looking for other related questions:
Should Duha prayer be made up if the time for it has ended?
Making Taraweeh prayer lengthy

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Related Answers:
Fasting ‘Ashoora’ for one who still owes days from Ramadaan
A non-Muslim is asking why Sunnah prayers are offered before the obligatory prayers
Praying Taraaweeh in congregation in Ramadaan is Sunnah and not a bid’ah (innovation)
Should Duha prayer be made up if the time for it has ended?
Making Taraweeh prayer lengthy

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