To answer a faction invite just do /f join <faction name>
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I assume you're talking about a faction invite. the command is /f join <faction>
To invite someone to your faction in Minecraft, do /f invite <player name>. They then need to do /f join <faction name> to accept your invitation.
A friend system is not built into the Minecraft game. Some servers have a friend system, the command is usually /friend add <name>
what I meant to ask was can someone invite me to minecraft realms
You use /f leave [faction name]