Submitting AOS/I-864 for Concurrent Cases

[nyrz01 14]

Earlier this year I submitted an I-864 for my  sibling as the joint sponsor (that case has not been scheduled for interview at the embassy, NVC has accepted that AOS) .  
Now I need to submit one for separate case which is for my wife.

Q : its ok to be the sponsor on 2 immigration cases at the same time? OR should I get just someone else as a Joint sponsor  (Note: my income is twice the income threshold )
Q : If I send AOS for my spouse, how do I add my sibling to the latest I-864 calculation of ppl in household? on the forms in Part 5 , should I add my  sibling under Item 6? But the wording on that Item says lawful permanent resident (in case of my sibling , the interview has not happened yet)?
 

[pushbrk 12,894]

If you qualify, you can certainly be the sponsor on more than one case.  If your sibling is not here yet, you do not count them on affidavit for your spouse.  People counted in item six would have to currently be a lawful resident.  Examples would be a former spouse you sponsored or anybody you previously sponsored who is still living, living in the US, and is not yet a citizen.