 If you liked
Akachan to Boku
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 ...then you might like
Gakuen Babysitters
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It has a brother taking care of his brother. They both really spoil each other, full of kids, in school, cute, adorable, and their loved ones are gone. Just go and read it. I could go on forever
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Recommended by Blackloud2116
A similar relationship between older and baby brothers. Akachan to Boku is definitely very "90s" while Gakuen Babysitters has more modern art and feeling. Gakuen Babysitters also has a more cute and uplifting feeling overall whereas the focus of Akachan to Boku seems to be more on exploring the complex relationship between siblings. Overall, though, you will get similar feelings by reading both.