US Immigration from Pakistan

Really sorry If I am in wrong forum

My brother has B2 visa, he visited back in 2018. That time I am not USC
In 2020 I got my Citizenship and I am wondering If is there any way, My brother can come on visit visa and I can apply for him or he can stay legally. (Is there any way ? )

I do know If I will apply for immigration it will take around 12 to 15 years.

I don't know how to proceed.

Scenario:

1. I am a USC and my wife is the one we are sponsoring for.

2. I am a college student so do not meet the threshold.

3. My wife uncle makes above the threshold and has agreed to sponser us

Uncle facts

1. The uncle does not live with us and live in another state.

2. Wife's uncle is married, no kids

Questions

1. Now what form will I do if any and what form will uncle do?

2. Does uncle only do the I 864 and that's it ?

3. Or do I do I 864 and then he does another 1 864 ?

4. Or do I do an I 864 and he does a I 864A ?

Summary

1. Please HELP, this is the second last thing on my plates

Thanks

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I am U.S citizen, my parents are in Pakistan I filed their immigration. we received notification in Jun 2022 that all documents are accepted and approved we should wait for interview call from Islamabad. we have been waiting since then. is there any timeline how long does it take ?

any help is appreciated.

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