If I'll be needed to mention the children of my spouse which weren't been adopted by myself and who are now in adult age.

It is a good idea to include all of your children and step children regardless of age.

I am going to Canada for first time H-1B stamping. Should I surrender the tear off I-94 portion of I-797A when I go to Canada?

Make a copy of both forms or scan for your records then enjoy your trip. They will keep the I-94 and issue a stamp for your passport when you return.

Could the withdrawal letter I-130 be written in handwriting or printed?

It does not matter whether you write or type or print your letter of withdrawal. They will not refund your application fee.

E-2 Application Form

You can read all about it at the USCIS website. Just do a Google search for USCIS and E-2 visa application.

How long the process take lto file a Petition for a Writ of Mandamus in Federal Court?

The mandamus process can be either fast or slow. Better approach may be to file for naturalization. If you married a US citizen you only need to...

Commission of a crime, even a misdemeanor can result in a finding that there is a lack of good moral character, but this is not always the result. ...

Can I get someone's help in this case?

Yes it is safe to apply for a change of status in the United States. Yes you can also bring your wife with you.

Is there anyway that he could ask for Asylum here in the US? Will it help if he reportes it to police now? Thanks for your help.

Yes your brother can request asylum in the US. However, he should seek the assistance of an experienced immigration attorney.

In FOIA what does "Referred to Immigration and Customs Enforcement" mean as many pages are blank which only read this.

It means that the pages the were redacted originated from ICE and that agency must approve which if any of those pages will be released.

E-2 Visa

Yes it matters which passport you use. You must use the passport from the country of your citizenship that qualifies you for the E-2 visa.