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If you want him gone, you can remove him as soon as you are sure of his gender. If you want to maybe-keep him, then just continue keeping him until a problem happens, but be ready to act promptly if you do see a problem. If no problems happen, then you've got one of those situations that works...

So that would make them about 7 weeks old? I think Gato is probably male, but I would wait a bit longer to be more sure, before making any permanent decisions.