The Beacons of Hope

[11:48 AM] Quantum Mobius Ferret: 1. Watch your language or face the Banhammer of the Starflame.  2. The metaphysical nature of the Tower makes it prone to exploding, don't TRY to detonate the magical C4 bricks.  3. The Dillo is Mine, hands off.  4. Be kind to lurkers, they may just be quiet given the crazy

Not hi, not by but cross them 'tween.
Not first, not third, but inbetween.

Slash the quad by me, and I remain
To call me a pair would not be in vain

I'm twice the one you'll ever be.
I'm not the loneliest number, though as bad as one I can be.

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An itch you can't reach is where you'll find me.
The regretful try and take me.
Those that can't move forwards all slide towards me.

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Thicker than water, I form a bond.
Your father, your mother, even your aunt.
I am the abstract of them all.
I am what we've formed in this tower tall.

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I stand at every open door, the greet of every guest.
I am the response to everyone who expresses gratitude best.
I am on the sign of the entrance before the door.
I am what all wish that they could feel more.

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The main event, which is exciting to me.
The description to your future is:
Four two one the three

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With the answers being "two", "back", "family", and "welcome", with the last one re-ordering them to spell out "Welcome back two the family"!