EU citizen entering on tourist visa intending to marry a USC, then return home; better to be upfront about it to immigrations?

You should not volunteer information unless the officer asks. Purpose of trip is to visit your fiancee. If officer asks, you can state that you are...

30/60 days rule

30/60/90 day rule says that if you file in the first 30 days it is assumed that person came in with an intent to stay. Is there a reason why you...

I have a permanent resident (green card) and girlfriend has a tourist visa, how can I apply for her a green card?

Talk to an attorney directly. If she travels so often to the US, she may actually need to leave even if you file while she is here.

Suggest you hire an attorney to review your package once it is ready.

Can I renew my EAC and stay in the US, after USCIS has reopened my case under a "Service Motion to Reopen" letter?

For starters, you should schedule an infopass appointment and go talk to the CIS in person. When your father filed for you, it could have been that...

Will be F1 OPT remain valid and be legally work after 90days unemployment while status of change is pending.

Yes. You should also confirm with the school's DSO.

I am out of status since June 2012. My boss wants to be my sponsor for green card. Is that possible since I was out of status?

Employment based green card is out of the question. Perhaps you will qualify to file for asylum? Also, you mentioned that you are single. If you...

If my unmarried sibling get married after I apply for him to come in USA, will it nullify my application? Or may I update it?

No effect.

H1B visa is expiring on 09/30/13. Want 2 go back 2 school on F1 Visa& how long i can attend classes after i receive I-20 ?

b/w- check with the school's DSO. I think if you file a change of status from H1 to F1, the school will permit you to take classes till the F1 is...

How long should I wait for my unmarried adult sons to come in USA after I have applied for them?

Perhaps your sons will qualify for a work visa?