1) Did anybody applied on their own and got approved?
----- Many
2) what are the documents to include?
------ I-485 receipt, 2 photographs, form I-131, USCIS fess $110 write in the cover letter that you need to visit for vacations or meet parents
3) Can we send the all the applications (Self,spouse&kids) in one envelope?
---- You can send in one envelope but they may mix photographs. I would send in separate envelopes.
**** With spouse application attach marriage certificate copy her I-485 receipt and your I-485 receipt
read the instructions of AP application form and out side the envelope write in big bold letters FORM I-131 for advanve parole