Is there anyway to stop someone from seeing I’m online when I’m playing Minecraft?

I started playing Minecraft with my young nephew and then set up a second account for myself and from that I started a realm that we both play on.

I didn’t think this through very well, because we’re now friends on both my accounts but sometimes I just want to play on my own. He’s only 9 and quite immature in some ways so saying “sorry, I just want to play on my own” is not a good option.

If I unfriend him on one of my accounts will he still be able to see when I’m playing? How do I block him? I don’t just want to block him from joining me, I want to block him from even seeing that I’m playing. (I don’t want to block him from the realm, just from seeing my other account is still active).

I really don’t want to have to create a 3rd account – I’m quite attached to some of my worlds.

I play on an iPad with whatever Minecraft version is on the App Store.