How can one prove domicile for INS if living with relatives?

How about cell phone bills? Do they have a driver's license or state ID card? Or paychecks? Or bank staements that come to your house?

they have 02-05 income tax returns, driver license, but no bills. My wife & I cover all their expenses. Immigration demanding more proof. Is a lawyer the next step?

The INS website says:

Evidence to establish proof of continuous residence in the United States during the requisite period of time may consist of any combination of the following:

(i) Past employment records, which may consist of pay stubs, W - 2 Forms, certification of the filing of Federal income tax returns on IRS Form 6166, state verification of the filing of state income tax returns, letters from employer(s) or, if the applicant has been in business for himself or herself, letters from banks and other firms with whom he or she has done business. In all of the above, the name of the alien and the name of the employer or other interested organization must appear on the form or let ter, as well as relevant dates. Letters from employers should be on employer letterhead stationery, if the employer has such stationery, and must include:

(A) Alien's address at the time of employment;

(B) Exact period of employment;

(C) Periods of layoff;

(D) Duties with the company;

(E) Whether or not the information was taken from official company records; and

(F) Where records are located and whether the Service may have access to the records.

If the records are unavailable, an affidavit form-letter stating that the alien's employment records are unavailable and why such records are unavailable may be accepted in lieu of (3)(i)(E) and (3)(i)(F) of this paragraph. This affidavit form-letter shall be signed, attested to by the employer under penalty of perjury, and shall state the employer's willingness to come forward and give testimony if requested.

(ii) Utility bills (gas, electric, phone, etc.), receipts, or letters from companies showing the dates during which the applicant received service are acceptable documentation.

(iii) School records (letters, report cards, etc.) from the schools that the applicant or their children have attended in the United States must show name of school and periods of school attendance.

(iv) Hospital or medical records showing treatment or hospitalization of the applicant or his or her children must show the name of the medical facility or physician and the date(s) of the treatment or hospitalization.

(v) Attestations by churches, unions, or other organizations to the applicant's residence by letter which:

(A) Identifies applicant by name;

(B) Is signed by an official (whose title is shown);

(C) Shows inclusive dates of membership;

(D) States the address where applicant resided during membership period;

(E) Includes the seal of the organization impressed on the letter or the letterhead of the organization, if the organization has letterhead stationery;

(F) Establishes how the author knows the applicant; and

(G) Establishes the origin of the information being attested to.

(vi) Additional documents to support the applicant's claim may include:

(A) Money order receipts for money sent in or out of the country;

(B) Passport entries;

(C) Birth certificates of children born in the United States;

(D) Bank books with dated transactions;

(E) Letters or correspondence between applicant and another person or organization;

(F) Social Security card;

(G) Selective Service card;

(H) Automobile license receipts, title, vehicle registration, etc.;

(I) Deeds, mortgages, contracts to which applicant has been a party;

(J) Tax receipts;

(K) Insurance policies, receipts, or letters; and

(L) Any other relevant document.