Can I obtain a lawyer to serve someone that was not able to be served before?

You can hire a lawyer or you can hire a process server.

How do I get them to stop accessing the property so frequently, or is this cause for me to terminate a 12 month lease early?

It does seem that the easiest way to address this problem is to talk amicably with the landlord.

How do I get tenant out of home? He is smoking cannabis, 6 month lease ending at end of this month.

If the lease is up, can you simply not extend the lease?

Eviction

I agree - it seems like you need to stick to your guns and refuse the rent.

What can i do ?

There isn't anything in the post to indicate that you have a legal right which has been violated. Did you sign any lease with your father?

Will any of these options work when my H1B will be in renewal process? Or what's the recommended option here?

H-4s are generally VERY simple and fast to obtain - go with that.

Why would there be a match anyways when I have a clean record? No crimes or arrests.

I have had cases where the name check took two years before it resolved. Your name may be common with individuals who are on government...

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Grade 9 talented kid founded Drone robotics,got life threat.Any room in USA with startup migration including sponsorship?

It sounds like you want the child to apply for asylum which is possible if the child is physically locating in the U.S.

How long can AP take in his situation&whats involved? Does answer "NO" to his arrest raised concerns although we explained it?

You can try following up with the consulate again, there may be additional investigations due to the confusion about the arrest. Udachi!

We want to get married but i don't know if that can help him to stay with me ?

Marriage to a U.S. citizen (for bona fide and non-immigration reasons) normally allows a person to qualify for a green card.