Is it possible to extend B1B2 visa more than one time ?

Yes you may request a second extension with evidence to support the request.

Can i file i130 and i 485 together while on deportation proceedings

More information is needed about your specific case and the basis for your NTA. Consult with an attorney for guidance.

No this alone should not detrimentally impact your citizenship application.

You can transfer your case to a waiver based one on a divorce and good faith marriage. It is best to work with an attorney for such a filing.

Affidavit of support for a Petition for an Alien Relative, not employed in US

You should use your tax returns to establish your income, even if employed overseas.

Hi I applied for my husband I 130 on 31 December,2019. He lives in Bangladesh and me in USA . Long long it take approval?

Refer to USCIS case processing page for processing times.

How can I get a naturalization certificate for my child?

Yes it is beneficial to have the naturalization certificate and you may file Form N600 to obtain this.

Yes your son-in-law should submit Form I864A as household member.

You may indicate your parents address for when you lived together.

Any problem with I485 if diagnosed with neurological disease?

No this is not a grounds of inadmissibility.