Green card through marriage?

Your husband’s US Passport will be sufficient. Do consider working with an experienced attorney as there is a lot of room for inadvertent error...

Can I leave the US after applying for an EAD?

Yes you can, it is always prudent to have a sit down consult with an attorney

Extend B2 Visa, Medical Emergency for grandson?

You ask many details oriented questions. A consult is appropriate. Many of us use Skype.

Ask your attorney because you have an attorney who is better familiar with your case and details.

Can I apply for Q1 visa?

Depends on the visa denial and if same will apply to Q1. Discuss with an attorney, many of us use Skype.

What should I write in DS-160 for Question: "has your US visa ever been canceled or revoked?"

Always answer truthfully. Provide supporting evidence. Consult and or retain an attorney with any related questions

Get a green card after previous visa violation

With weekly immigration law changes under this administration it would be prudent for you to work with an immigration attorney. I would also...

To whom should I address the check for I-130 ?

Review the corresponding filing instructions and review them carefully so your case is accepted

Can I invite my mummy to us,am a green card holder

A green card holder can’t petition for parents; only spouse and unmarried children

How long we need to wait.

Next the case will be transferred to the National Visa Center for Consular Processing